test: add E2E tests for --enable-cross-namespace flag

[sapphirew]

Issue #, if available:

Description of changes:

Regenerate iam-controller using updated code-generator and runtime that introduce the unified --enable-cross-namespace flag with phased rollout.

Generated code changes:

• Renames EnableCrossNamespaceReferences to EnableCrossNamespace
• Updates ValidateCrossNamespaceReference to return (string, bool, error)
• Adds --enable-cross-namespace flag to Helm deployment template
• Adds enableCrossNamespace: true to Helm values (Phase 1 default)

E2E tests cover three scenarios:

• flag=true (Phase 1 default): cross-namespace ref succeeds with ACK.CrossNamespaceDeprecation condition as deprecation warning
• flag=false: cross-namespace ref rejected with ACK.Terminal condition containing the --enable-cross-namespace flag name
• same-namespace: ref always succeeds regardless of flag value with no deprecation condition present

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sapphirew
Once this PR has been reviewed and has the lgtm label, please assign a-hilaly for approval by writing /assign @a-hilaly in a comment. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[kprahulraj]

Doc changes is added - aws-controllers-k8s/docs#37

[ack-prow]

@sapphirew: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
iam-crd-compat-check	5284d5a	link	true	/test iam-crd-compat-check
iam-verify-code-gen	01b525c	link	true	/test iam-verify-code-gen

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.