Bugfix to correct GCSHook being called even when not required with BeamRunPythonPipelineOperator

[zstrathe]

This resolves #38713 by modifying BeamRunPythonPipelineOperator.execute_sync() to only call GCSHook when necessary

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[boring-cyborg]

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[eladkal]

Please also add unit test. bug fix must be covered by test to avoid regression

[e-galan]

The changes look good to me @zstrathe. What do you think @eladkal ?

[potiuk]

Static checks need fixing.

[zstrathe]

@potiuk Static checks should pass now. I sincerely apologize for that, I'll ensure to run pre-commit checks for any future contributions.

[potiuk]

Nothing to be sorry about :)

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.