Closes AI-358
This PR hides the chevron and removes hover styles from the project
header when there is an active search, given groups can't be collapsed
while that's happening. We could allow it, but I think it's not super
worth it; this feels like like a pragmatic move.
Release Notes:
- Sidebar: Fixed a bug where affordances to collapse the project header
would appear when searching.
Danilo Leal
5893947924