Add gemini 2.5 pro and flash models

[go-to-the-future]

A### All Submissions (required):

• Have you read the Contributing guidelines?
• Have you updated the documentation with pnpm docs?
• Have you ran the linter with pnpm lint:fix?
• Have you successfully ran the tests locally with pnpm test?
• Have you added a changeset file with pnpm changeset?
• Please link any relevant GitHub issue here.

What: As titled
Why: To support new versions of gemini

Evidence:

https://ai.google.dev/gemini-api/docs/models

[go-to-the-future]

@RPate97 friendly ping

[CGeorges]

any updates on this? I would like to integrate the new models in my application.