[devtools] panel ui issues tab content (#80729)
The UI shares the style with the error overlay. This PR added a loading
state, which can be later shared with the error overlay as well.
https://github.com/user-attachments/assets/d3759d19-7f70-48c3-8fee-5c6973c01d53
### Success Criteria
- [x] Does it have a loading state?
- [x] Does it have its own scrollbar?
- [x] Does it have an empty error state?
- [x] Does it have the new feedback button on the toolbar?
Closes NEXT-4545
Closes NEXT-4556
Closes NEXT-4554
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Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
