refactor(ai-logic): remove deprecated Imagen APIs

[thatfiredev]

Removes the Imagen APIs that we previously deprecated in #7988 and #8085

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[thatfiredev]

/gemini review

[gemini-code-assist]

Code Review

This pull request completely removes the deprecated Imagen APIs, including ImagenModel, TemplateImagenModel, and all associated configuration classes, futures wrappers, tests, and public API declarations. This is a breaking change. I have no feedback to provide as there are no review comments.

[github-actions]

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