agent: Add "Install MCPs" to panel menu (#28616)

Also took the opportunity to rename the "Continue in New Thread" item to
a potentially clearer name.

<img
src="https://github.com/user-attachments/assets/024de07d-f215-4c41-8fbe-652a216b61d9"
width="300"/>

Release Notes:

- N/A
17719f9f87Danilo Leal committed on 4/12/2025, 12:39:50 AM· committed by GitHubparent055df30
1 file changedLine totals unavailable