Enable some tests in runner v2 batch mode.

[shunping]

Background: #20666 (comment)

I discovered that some state tests are actually skipped on Dataflow Runner V2 batch mode.

By re-enabling two previously excluded categories: `UsesOnWindowExpiration' and 'UsesStatefulParDo', we let ~50 more tests run in the post-commit workflow.

[gemini-code-assist]

Summary of Changes

Hello @shunping, 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 aims to enhance the robustness of the Dataflow V2 runner by re-integrating specific test categories that were previously excluded. By enabling tests for window expiration and stateful ParDo operations, the change ensures more comprehensive validation of these critical functionalities within the V2 runner's batch processing capabilities.

Highlights

• Test Enablement: Two previously excluded test categories, 'UsesOnWindowExpiration' and 'UsesStatefulParDo', have been re-enabled for the 'validatesRunnerV2Test' task in the Dataflow V2 runner. This expands the test coverage for batch mode operations.
• CI Trigger: A minor, trivial change was made to a GitHub trigger file to ensure the associated CI pipeline for the Dataflow V2 validation tests is initiated.

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[shunping]

Ok. Only two tests failed after enabling back categories: org.apache.beam.sdk.testing.UsesOnWindowExpiration and org.apache.beam.sdk.testing.UsesStatefulParDo

DataflowRunnerTest > testBatchGroupIntoBatchesOverrideBytes FAILED
    java.lang.AssertionError at DataflowRunnerTest.java:2286

DataflowRunnerTest > testBatchGroupIntoBatchesOverrideCount FAILED
    java.lang.AssertionError at DataflowRunnerTest.java:2212

Both of them failed with java.lang.AssertionError.

However, this change also increase the number of tests running with this post-commit test task from 241 to 290, which includes the tests for states.

Before:

After: