updating the models

[sedanah-m]

Updates deprecated Gemini model strings across integration tests and e2e smoke tests.

[changeset-bot]

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Latest commit: 03f8b97

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[gemini-code-assist]

Code Review

This pull request updates various Gemini model references to newer versions (such as gemini-3.1 and gemini-3.5) across sample apps, integration tests, and constants. The review feedback highlights two critical issues where incorrect model names are used: a typo in the chat integration test checking for 'gemini-3.1-flash-preview' instead of 'gemini-3.1-flash-lite', and the 'cheapestModel' constant being set to 'gemini-3.5-flash-lite' which is not defined in the list of valid model names.

[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v17.0