Add Gemini 3.5 flash models to testing

[emilypgoogle]

Gemini 3.5 was recently released and passes existing testing, should be tested for the future.

[gemini-code-assist]

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[github-actions]

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[emilypgoogle]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds support for Gemini 3.5 Flash models to the AIModels class for Android integration tests, introducing vertexAI3_5FlashModel and googleAI3_5FlashModel. The review feedback highlights two main issues: first, Vertex AI is a regional service and does not support a "global" location, so using "global" will cause runtime errors; second, the newly introduced variable names violate the Kotlin Style Guide because they contain underscores and should be renamed to standard camelCase (e.g., vertexAI35FlashModel and googleAI35FlashModel).

[rlazo]

The amount of different possible variables is starting to reach the point where we need to consider alternatives. Let's move forward but start looking at alternatives