fix: do not allow spec update on mtpnc

[isaac-dasan]

Signed-off-by: GitHub [email protected]

Reason for Change:
Prevent users from updating spec of mtpnc, pn, pni once objects are created

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• relevant PR labels added

Notes:

[Copilot]

Pull Request Overview

This PR adds immutability validation to prevent spec updates after creation for three Kubernetes custom resources: MultitenantPodNetworkConfig (mtpnc), PodNetwork (pn), and PodNetworkInstance (pni).

• Adds Kubernetes validation rules to make spec fields immutable after resource creation
• Implements consistent validation across all three multitenancy CRD types
• Updates both Go API definitions and generated YAML manifests

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
multitenantpodnetworkconfig.go	Adds kubebuilder validation annotation for spec immutability
podnetwork.go	Adds kubebuilder validation annotation for spec immutability
podnetworkinstance.go	Adds kubebuilder validation annotation for spec immutability
multitenancy.acn.azure.com_multitenantpodnetworkconfigs.yaml	Generated YAML manifest with x-kubernetes-validations for spec immutability
multitenancy.acn.azure.com_podnetworks.yaml	Generated YAML manifest with x-kubernetes-validations for spec immutability
multitenancy.acn.azure.com_podnetworkinstances.yaml	Generated YAML manifest with x-kubernetes-validations for spec immutability

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