Fix PostCommit Python ValidatesRunner Dataflow job

[Amar3tto]

Fixes #36144
Successful run: https://github.com/apache/beam/actions/runs/17726486150

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Summary of Changes

Hello @Amar3tto, 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 resolves an issue with the PostCommit Python ValidatesRunner Dataflow job by modifying a specific test case. The change ensures that the test_group_by_key_importable_special_types test, which relies on the dill serialization library, correctly imports and uses dill, preventing failures in environments where dill might not be readily available or properly recognized by the test runner.

Highlights

• Test Fix: Addressed a failure in the PostCommit Python ValidatesRunner Dataflow job related to a specific test case.
• Dill Dependency Handling: Ensured the test_group_by_key_importable_special_types test correctly handles its dependency on the dill library.
• Pytest Markers and Imports: Introduced @pytest.mark.uses_dill and pytest.importorskip("dill") to manage the dill dependency within the test, allowing it to be skipped if dill is not available.

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[github-actions]

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R: @tvalentyn for label python.

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[Abacn]

cc: @claudevdm to confirm this is intended