Correctly override apache/beam containers for RC on Dataflow runner job submission

[Abacn]

Java counterpart for #32049

Tested with a java using python rc pipeline

This has been affecting DataflowTemplates RC validation.

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where Dataflow job submissions using Apache Beam release candidate (RC) container images were encountering validation failures. The core change introduces a mechanism to normalize these RC image tags by stripping the 'rc' suffix, making them compatible with Dataflow's expected image naming conventions. This enhancement ensures the successful execution of pipelines utilizing RC SDKs and improves the reliability of DataflowTemplates RC validation.

Highlights

• Container Image Normalization: Implemented a new static method, normalizeDataflowImageAndTag, to correctly process and normalize container image tags, specifically removing the 'rc' suffix from Apache Beam Python and Go SDK release candidate images.
• Dataflow Runner Integration: Modified the applySdkEnvironmentOverrides method in DataflowRunner to utilize the new normalization logic, ensuring that apache/beam container images with 'rc' tags are properly mapped to their corresponding Dataflow-compatible images during job submission.
• Improved Test Coverage: Added a new test case, testApplySdkEnvironmentOverridesRcByDefault, to specifically validate the correct handling and normalization of release candidate container image tags, ensuring the fix works as intended.
• Test Code Refactoring: Introduced a helper method containerUrlToPipeline in the test suite to reduce boilerplate and improve readability for tests involving RunnerApi.Pipeline creation.

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[github-actions]

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R: @robertwb added as fallback since no labels match configuration

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[Abacn]

R: @Amar3tto (for future rc validation - 2.69.0+)

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[Abacn]

R: @damccorm

[damccorm]

Thanks!