[tvalentyn]

Use similar control flow as .github/workflows/beam_Upgrade_Google_Ads_Version.yml

[github-actions]

📋 Review Summary

This PR updates the beam_Upgrade_GCP_BOM.yml and update_python_dependencies.yml workflows to configure git authentication via gh auth setup-git before pushing branches, which is required because actions/checkout runs with persist-credentials: false. It also replaces the broken gitDiff vs gitdiff variable check with a clean if ! git diff --cached --quiet; then check.

🔍 General Feedback

• The changes align the commit and push control flow with beam_Upgrade_Google_Ads_Version.yml and resolve both the missing git credentials issue and the case-mismatch bug (gitdiff vs gitDiff) in the previous diff check.
• Everything looks clean, minimal, and ready to merge.

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[tvalentyn]

Testing on https://github.com/apache/beam/actions/runs/41561774824

[derrickaw]

Hi @tvalentyn, is #40960 replacing this one? Thanks

[tvalentyn]

No, #40960 is autogenerated PR to upgrade dependencies; it was not being created before because the tool didn't have permissions to push a PR out. My commit from this PR was included there by necessity to test the autogeneration. It would be cleaner to separate the changes.