We started getting Bad Requests from the Copilot Chat API.
Seems like Microsoft stopped supporting this:
<img width="331" alt="image"
src="https://github.com/user-attachments/assets/46050063-f031-4836-82ff-219bdd45639a"
/>


Release Notes:

- agent: Disable `claude-3-7-sonnet-thinking` for Copilot Chat Provider
because it is not supported by Copilot Chat

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>