Add spinner when group membership is slow to load in new UI
It takes longer than seven seconds on a FreeNAS Mini for the group membership to show any data. This probably indicates a problem, but any function that can take this long should show either a spinner or a progress bar to give the user feedback that something is actually happening.
To recreate: click Account/Groups. Click the three-dots options icon for any group and select Members. Wait for data to appear.