Update Gemini API URL and model version

[chitadi]

Seems like 2.5-pro has been deprecated on the v1beta endpoint which caused the first error.

The v1 endpoint's GenerationConfig object currently lacks the responseMimeType and responseSchema fields entirely, causing the second error. This is why v1beta was used to begin with.

As with most AI tools, the model/name in the code will have to be updated every time a major release is made by Google. Modified the model to point to 3.1-pro-preview and reverted the v1 change to v1beta.

[gemini-code-assist]

Summary of Changes

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This pull request addresses breaking changes in the Gemini API integration by reverting to the v1beta endpoint and updating the default model version. These changes ensure that the gap analyzer tool remains functional with the latest Google AI service requirements.

Highlights

• API Endpoint Reversion: Reverted the Gemini API base URL from v1 back to v1beta to ensure continued support for essential configuration fields like responseMimeType and responseSchema.
• Model Version Upgrade: Updated the default Gemini model to gemini-3.1-pro-preview to accommodate the deprecation of the previous 2.5-pro version.

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[OpenConfigBot]

Pull Request Functional Test Report for #5454 / 14641a6

No tests identified for validation.

Help

[gemini-code-assist]

Code Review

This pull request updates the Gemini API URL to the v1beta version and changes the default model identifier to gemini-3.1-pro-preview. Feedback indicates that the specified model name is invalid and will result in API failures, suggesting a revert to a stable identifier like gemini-1.5-pro.