chore: [Many APIs] remove unused proto imports (#5459)

* chore: remove unused proto imports

PiperOrigin-RevId: 468735472

Source-Link: googleapis/googleapis@cfa1b37

Source-Link: https://github.com/googleapis/googleapis-gen/commit/09b7666656510f5b00b893f003a0ba5766f9e250
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>