Repin pip to 2.50.1 to fix hanging yaml xlang workflow

[shunping]

Looks like pip 2.53.0 is also causing :sdks:python:installGcpTest stuck in workflow (https://github.com/apache/beam/actions/workflows/beam_PreCommit_Yaml_Xlang_Direct.yml)

https://github.com/apache/beam/actions/runs/20081968748/job/57610953116

Re-pinning the pip version.

[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 attempts to resolve recurring xlang test failures by stabilizing the Python environment's pip dependency. The primary change involves pinning the pip version to 25.0.1 during the build process, circumventing known issues with newer pip releases that were causing build and test instability. Additionally, adjustments were made to test triggering mechanisms to ensure proper validation of the fix.

Highlights

• Pip Version Pinning: The pip version used in the build process has been explicitly pinned to 25.0.1. This addresses issues where pip 23.3 caused hash mismatches and pip 25.1 led to the :sdks:python:installGcpTest becoming stuck.
• Test Trigger File Removal: The .github/trigger_files/beam_PreCommit_Python_ML.json file, which was previously used to trigger a specific test suite, has been removed.
• CI Trigger Update: A trivial comment was added to sdks/python/setup.py to explicitly trigger CI tests, likely to validate the changes introduced in this pull request.

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[shunping]

The workflow passed again after re-pinning. https://github.com/apache/beam/actions/runs/20170681485/job/57905333559?pr=37092