Codestral and copilot has a custom menu being built out. While the
common menu has the configure provider quick setting, the custom menu
doesn't have them. however it is a neat feature to have and quickly
switch it out.

Furthermore, copilot has an option of "Use zed AI" when copilot isn't
signed in. Instead add the complete list and configure provider when it
is not signed in

Before
<img width="256" height="588" alt="Screenshot 2026-04-11 at 4 46 47 PM"
src="https://github.com/user-attachments/assets/7de1c09c-a7a0-46d1-9572-fa5e970c77a8"
/>
<img width="230" height="480" alt="Screenshot 2026-04-11 at 4 47 00 PM"
src="https://github.com/user-attachments/assets/7075538f-1966-4ece-985f-b5e0d1d50f4a"
/>

After
<img width="259" height="663" alt="Screenshot 2026-04-11 at 5 02 48 PM"
src="https://github.com/user-attachments/assets/31094f7b-8efa-488a-87d8-1998e554ec74"
/>
<img width="242" height="580" alt="Screenshot 2026-04-11 at 5 03 21 PM"
src="https://github.com/user-attachments/assets/aba8ba09-1fbd-4c43-ba1f-af7ed51551a4"
/>
<img width="224" height="253" alt="Screenshot 2026-04-11 at 5 03 44 PM"
src="https://github.com/user-attachments/assets/108e7b6f-1216-4a2c-b0c0-7be3dc5438b0"
/>


Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes NA

Release Notes:

- added configure provider menu item to copilot and codestral

---------

Signed-off-by: Pranav <pranav10121@gmail.com>
Co-authored-by: Ben Kunkle <ben@zed.dev>