[AI] Developer API and Imagen generate GA

[paulb777]

Update Changelogs and API docs in advance of upcoming Developer API and Imagen generate GA

[gemini-code-assist]

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[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the documentation and changelog to reflect that the Developer API and Imagen generation APIs are now Generally Available. The changes correctly remove the 'Public Preview' warnings. My review focuses on ensuring that the documentation remains clear and complete after these removals. I've pointed out a few places where function summaries were accidentally removed and should be restored. I also have a minor suggestion for the changelog to improve consistency.