Support Gemini 3.1 Pro to BYOK Models in GitHub Copilot

[bharatvansh]

I would like to request support for Gemini 3.1 Pro in the Bring Your Own Key (BYOK) model configuration for GitHub Copilot.

Gemini 3.1 Pro is the successor to Gemini 3.0 Pro. Since Gemini 3.0 pro model is expected to be deprecated soon, adding support for Gemini 3.1 Pro would ensure continued Support for Gemini API Model.

Please consider adding Gemini 3.1 Pro as a supported BYOK model. Thank You.