[FLINK-37911][Helm] Reorganize Helm chart templates

[ChenYi015]

What is the purpose of the change

• To make [FLINK-37669][HELM] Add Helm chart unit tests to flink kubernetes operator #971 easier to review, reorganize the Helm chart templates without any refactoring:

Brief change log

Reorganize the directory structure of Helm chart as follows:

$ # Before
$ tree helm/flink-kubernetes-operator
helm/flink-kubernetes-operator
├── .helmignore
├── Chart.yaml
├── conf
│   ├── flink-conf.yaml
│   ├── log4j-console.properties
│   └── log4j-operator.properties
├── crds
│   ├── flinkdeployments.flink.apache.org-v1.yml
│   ├── flinksessionjobs.flink.apache.org-v1.yml
│   └── flinkstatesnapshots.flink.apache.org-v1.yml
├── templates
│   ├── _helpers.tpl
│   ├── flink-operator.yaml
│   ├── rbac.yaml
│   ├── serviceaccount.yaml
│   └── webhook.yaml
└── values.yaml

$ # After
$ tree helm/flink-kubernetes-operator
helm/flink-kubernetes-operator
├── .helmignore
├── Chart.yaml
├── conf
│   ├── flink-conf.yaml
│   ├── log4j-console.properties
│   └── log4j-operator.properties
├── crds
│   ├── flinkdeployments.flink.apache.org-v1.yml
│   ├── flinksessionjobs.flink.apache.org-v1.yml
│   └── flinkstatesnapshots.flink.apache.org-v1.yml
├── templates
│   ├── _helpers.tpl
│   ├── cert-manager
│   │   ├── certificate.yaml
│   │   └── issuer.yaml
│   ├── controller
│   │   ├── configmap.yaml
│   │   └── deployment.yaml
│   ├── flink
│   │   ├── _helpers.tpl
│   │   ├── role.yaml
│   │   ├── role_binding.yaml
│   │   └── service_account.yaml
│   ├── rbac
│   │   ├── _helpers.tpl
│   │   ├── cluster_role.yaml
│   │   ├── cluster_role_binding.yaml
│   │   ├── role.yaml
│   │   ├── role_binding.yaml
│   │   └── service_account.yaml
│   └── webhook
│       ├── _helpers.tpl
│       ├── mutating_webhook_configuration.yaml
│       ├── secret.yaml
│       ├── service.yaml
│       └── validating_webhook_configuration.yaml
└── values.yaml

Verifying this change

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

One can verify there is no changes to the rendered manifests as follows:

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changes to the CustomResourceDescriptors: (no)
• Core observer or reconciler logic that is regularly executed: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[ChenYi015]

One can verify that there is no changes to the templated manifests after this reorganization:

$ # main branch
$ git checkout main

$ # helm template with default values
$ helm template flink-operator helm/flink-kubernetes-operator | yq eval-all '[.] | map(select(length > 0)) | sort_by(.kind,.metadata.name,.metadata.namespace) | .[] | splitDoc' > before-1.yaml

$ # helm template with multi-namespaces values
$ helm template flink-operator helm/flink-kubernetes-operator --set 'watchNamespaces={ns1,ns2,ns3}' | yq eval-all '[.] | map(select(length > 0)) | sort_by(.kind,.metadata.name,.metadata.namespace) | .[] | splitDoc' > before-2.yaml

$ # this branch
$ git checkout helm/reorganize-templates

$ # helm template with default values
$ helm template flink-operator helm/flink-kubernetes-operator | yq eval-all '[.] | map(select(length > 0)) | sort_by(.kind,.metadata.name,.metadata.namespace) | .[] | splitDoc' > after-1.yaml

$ # helm template with multi-namespaces values
$ helm template flink-operator helm/flink-kubernetes-operator --set 'watchNamespaces={ns1,ns2,ns3}' | yq eval-all '[.] | map(select(length > 0)) | sort_by(.kind,.metadata.name,.metadata.namespace) | .[] | splitDoc' > after-2.yaml

$ # diff
$ diff before-1.yaml after-1.yaml
1c1
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/cert-manager/certificate.yaml
23c23
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/cluster_role.yaml
139c139
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/cluster_role_binding.yaml
159c159
< # Source: flink-kubernetes-operator/templates/flink-operator.yaml
---
> # Source: flink-kubernetes-operator/templates/controller/configmap.yaml
418c418
< # Source: flink-kubernetes-operator/templates/flink-operator.yaml
---
> # Source: flink-kubernetes-operator/templates/controller/deployment.yaml
558c558
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/cert-manager/issuer.yaml
567c567
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/mutating_webhook_configuration.yaml
595c595
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role.yaml
636c636
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role_binding.yaml
658c658
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/secret.yaml
667a668
> # Source: flink-kubernetes-operator/templates/webhook/service.yaml
680c681
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/service_account.yaml
694c695
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/service_account.yaml
706c707
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/validating_webhook_configuration.yaml

$ diff before-2.yaml after-2.yaml 
1c1
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/cert-manager/certificate.yaml
23c23
< # Source: flink-kubernetes-operator/templates/flink-operator.yaml
---
> # Source: flink-kubernetes-operator/templates/controller/configmap.yaml
284c284
< # Source: flink-kubernetes-operator/templates/flink-operator.yaml
---
> # Source: flink-kubernetes-operator/templates/controller/deployment.yaml
424c424
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/cert-manager/issuer.yaml
433c433
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/mutating_webhook_configuration.yaml
466c466
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role.yaml
507c507
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role.yaml
548c548
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role.yaml
589c589
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role.yaml
613a614
> # Source: flink-kubernetes-operator/templates/rbac/role.yaml
729c730
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role.yaml
845c846
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role.yaml
961c962
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role_binding.yaml
981c982
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role_binding.yaml
1001c1002
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role_binding.yaml
1021c1022
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/role_binding.yaml
1041c1042
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role_binding.yaml
1063c1064
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role_binding.yaml
1085c1086
< # Source: flink-kubernetes-operator/templates/rbac.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/role_binding.yaml
1107c1108
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/secret.yaml
1116a1118
> # Source: flink-kubernetes-operator/templates/webhook/service.yaml
1129c1131
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/service_account.yaml
1143c1145
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/service_account.yaml
1157c1159
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/flink/service_account.yaml
1171c1173
< # Source: flink-kubernetes-operator/templates/serviceaccount.yaml
---
> # Source: flink-kubernetes-operator/templates/rbac/service_account.yaml
1183c1185
< # Source: flink-kubernetes-operator/templates/webhook.yaml
---
> # Source: flink-kubernetes-operator/templates/webhook/validating_webhook_configuration.yaml