Add default_pickle_library_override delegation to InteractiveRunner

[praneetnadella]

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Summary of Changes

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This pull request enhances the InteractiveRunner by introducing a delegation mechanism for the default_pickle_library_override method. This change ensures that the interactive runner can properly inherit and respect the serialization preferences of its configured underlying runner, providing more consistent and flexible behavior when handling pickling operations within Beam pipelines.

Highlights

• Pickler Delegation: The InteractiveRunner now includes a default_pickle_library_override method that delegates the choice of the default pickling library to its _underlying_runner.
• Robustness: The delegation includes a fallback mechanism, ensuring that if the _underlying_runner does not define default_pickle_library_override, the InteractiveRunner's own base class implementation is used.
• Test Coverage: New unit tests were added to interactive_runner_test.py to verify both the successful delegation of the pickler override and the correct fallback behavior.

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Changelog

• sdks/python/apache_beam/runners/interactive/interactive_runner.py
  • Implemented default_pickle_library_override to delegate to the underlying runner or fallback to the superclass.
• sdks/python/apache_beam/runners/interactive/interactive_runner_test.py
  • Imported PipelineRunner for type hinting in tests.
  • Added test_default_pickle_library_override_delegates to verify successful delegation.
  • Added test_default_pickle_library_override_fallback to ensure graceful fallback when the underlying runner lacks the method.

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[praneetnadella]

R: @claudevdm

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