Fix extension list scrolling and add loading and empty states (#7782)

This PR fixes the scrolling of the extension list, as well as adds
various empty and loading states.

Release Notes:

- N/A
b14fbd4ddcMarshall Bowers committed on 2/14/2024, 5:47:58 PM· committed by GitHubparentb47aff4
1 file changedLine totals unavailable