Add a Microsoft Foundry model to the GitHub Copilot app

### Display name This is the friendly name displayed by the GitHub Copilot app. It does not have to match the Azure model or deployment name: “`text GPT-5.6-sol on Azure Production reasoning model Foundry GPT-5.6 “` ### Wire model This is the identifier sent in the `model` property of the request. Azure OpenAI routes requests …