chore: cleanup; annotations updates; adding missing imports

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PiperOrigin-RevId: 489578716

Source-Link: https://github.com/googleapis/googleapis/commit/8bd04efa97856bb1953f6fe876ab8fa3236ba015

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BEGIN_NESTED_COMMIT build: add LRO mixin to datacatalog PiperOrigin-RevId: 489512915

Source-Link: https://github.com/googleapis/googleapis/commit/b6c488107c1754be783ca6a7b7e9c7b341a011f8

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docs: documentation updates chore: cleanup; annotations updates; adding missing imports

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Source-Link: https://github.com/googleapis/googleapis/commit/a6efcc9b7addae8a95fa76d610845a8b08f12fc4

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