collab panel: Unfocus filter editor on escape (#16579)

This has been bugging me for a while, because it meant I was stuck in
the collab panel when I accidentally navigated there via keyboard
shortcuts.

Now I can press esc and get out of that state.

Release Notes:

- Fixed `esc` not removing focus from the filter editor in the
collaboration panel.

### Before


https://github.com/user-attachments/assets/3bebac03-0e6a-49b0-9823-d9f3190aa5d2


### After


https://github.com/user-attachments/assets/d04c309d-9d1c-44b6-abd3-d48f55207e31