line errors fixed with ruff

[Noam173]

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[keerthanakadiri]

Hi @Noam173, Can you sign the CLA? Thank you !

[mihaimaruseac]

Some of the imports are needed for the side effects. Other changes actually match the code style used by Google, so they should not be changed.

This PR is huge and will require too many people to review to land.

Closing as spam, as it looks like nothing of the CONTRIBUTING.md was read and used.