sunset deprecated gemini 1.5 models

[JINO-ROHIT]

gemini 1.5 models have been deprecated, so removed them from the repo.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch gemini-depr

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[fengju0213]

thanks @JINO-ROHIT