Fix PreCommit Xlang Generated Transforms job

[Amar3tto]

Fixes #36481
Successful runs:
https://github.com/apache/beam/actions/runs/22443970856
https://github.com/apache/beam/actions/runs/22443442502

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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 addresses flakiness in the "PreCommit Xlang Generated Transforms" job by implementing deterministic sorting for external transform configurations. The changes ensure that both the generated configuration files and the comparison logic in the integration test consistently handle the ordering of transforms and their parameters, thereby stabilizing the build process.

Highlights

• Test Stability: Introduced a normalization function in external_transform_provider_it_test.py to sort external transform configurations and their fields deterministically before comparison, resolving flakiness caused by non-deterministic ordering.
• Configuration Generation: Updated gen_xlang_wrappers.py to ensure that discovered external transforms and their configuration parameters are processed in a deterministic order, leading to consistent generated configuration files.

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Changelog

• sdks/python/apache_beam/transforms/external_transform_provider_it_test.py
  • Added a _normalize helper function to sort test_config and standard_config before assertion.
  • Modified the assertEqual call to use the normalized configurations.
• sdks/python/gen_xlang_wrappers.py
  • Changed iteration over discovered.items() to sorted(discovered.keys()) to process transforms deterministically.
  • Changed iteration over wrapper.configuration_schema.values() to sorted(wrapper.configuration_schema.keys()) to process parameters deterministically.

Activity

• The pull request was opened to fix issue The PreCommit Xlang Generated Transforms job is flaky #36481.
• Successful runs of the PreCommit Xlang Generated Transforms job have been observed and linked, indicating the fix is working.

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[damccorm]

Thanks!