terraform test: re-enable aws terraform CI tests (#33789)

<!--
Describe the contents of the PR briefly but completely.

If you write detailed commit messages, it is acceptable to copy/paste
them
here, or write "see commit messages for details." If there is only one
commit
in the PR, GitHub will have already added its commit message above.
-->

### Motivation

The yaml merge issue should now be fixed in v0.5.3 as per:
MaterializeInc/terraform-aws-materialize#78 so
re-enabling the tests.

Successful run:
https://buildkite.com/materialize/nightly/builds/13684#0199beaa-25ab-4cfb-ad35-bbe9211da59f

<!--
Which of the following best describes the motivation behind this PR?

  * This PR fixes a recognized bug.

    [Ensure issue is linked somewhere.]

  * This PR adds a known-desirable feature.

    [Ensure issue is linked somewhere.]

  * This PR fixes a previously unreported bug.

    [Describe the bug in detail, as if you were filing a bug report.]

  * This PR adds a feature that has not yet been specified.

[Write a brief specification for the feature, including justification
for its inclusion in Materialize, as if you were writing the original
     feature specification.]

   * This PR refactors existing code.

[Describe what was wrong with the existing code, if it is not obvious.]
-->

### Tips for reviewer

<!--
Leave some tips for your reviewer, like:

    * The diff is much smaller if viewed with whitespace hidden.
    * [Some function/module/file] deserves extra attention.
* [Some function/module/file] is pure code movement and only needs a
skim.

Delete this section if no tips.
-->

### Checklist

- [ ] This PR has adequate test coverage / QA involvement has been duly
considered. ([trigger-ci for additional test/nightly
runs](https://trigger-ci.dev.materialize.com/))
- [ ] This PR has an associated up-to-date [design
doc](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/design/README.md),
is a design doc
([template](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/design/00000000_template.md)),
or is sufficiently small to not require a design.
  <!-- Reference the design in the description. -->
- [ ] If this PR evolves [an existing `$T ⇔ Proto$T`
mapping](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/command-and-response-binary-encoding.md)
(possibly in a backwards-incompatible way), then it is tagged with a
`T-proto` label.
- [ ] If this PR will require changes to cloud orchestration or tests,
there is a companion cloud PR to account for those changes that is
tagged with the release-blocker label
([example](MaterializeInc/cloud#5021)).
<!-- Ask in #team-cloud on Slack if you need help preparing the cloud
PR. -->
- [ ] If this PR includes major [user-facing behavior
changes](https://github.com/MaterializeInc/materialize/blob/main/doc/developer/guide-changes.md#what-changes-require-a-release-note),
I have pinged the relevant PM to schedule a changelog post.

Author: bobbyiliev

ci/nightly/pipeline.template.yml

@@ -1400,7 +1400,6 @@ steps:
             args: [--no-cleanup]
             ci-builder: stable
       branches: "main v*.* *aws* *tf* *terraform* *helm* *self-managed* *orchestratord*"
-      skip: "https://github.com/MaterializeInc/terraform-aws-materialize/issues/71"
 
     - id: terraform-aws-upgrade
       label: "Terraform + Helm Chart Upgrade on AWS"

test/terraform/aws-temporary/main.tf

@@ -51,7 +51,7 @@ variable "orchestratord_version" {
 }
 
 module "materialize_infrastructure" {
-  source = "git::https://github.com/MaterializeInc/terraform-aws-materialize.git?ref=v0.5.2"
+  source = "git::https://github.com/MaterializeInc/terraform-aws-materialize.git?ref=v0.5.3"
 
   providers = {
     aws        = aws
@@ -74,17 +74,11 @@ module "materialize_infrastructure" {
   install_cert_manager           = false
   use_self_signed_cluster_issuer = false
 
-  # TODO: This currently fails: https://github.com/MaterializeInc/terraform-aws-materialize/issues/71
   helm_values = {
     operator = {
       args = {
         enableLicenseKeyChecks = true
       }
-      clusters = {
-        # Overriding here because merging values doesn't work.
-        # Remove this when that is fixed.
-        swap_enabled = false
-      }
     },
   }