[AI] Annotate Imagen integration tests as deprecated

[andrewheard]

• Annotated the Imagen integration tests with @available(*, deprecated) to silence the deprecation warnings.
• Removed ImagenModel.generateImages(prompt:gcsURI:) and ImagenGCSImage since they were never public.
• Removed Imagen + GCS unit tests.
• Cleaned-up outdated TODOs.

#no-changelog

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[paulb777]

LGTM on good CI