Losing focus state when closing delete panel on /uploaded-recordings

Steps to reproduce:

1. Go to https://profiler.firefox.com/uploaded-recordings/ (and have at least one uploaded profile).
1. Tab through the document until a Delete button is focused.
1. Press space to open the confirmation panel.
1. Press tab to put focus inside the confirmation panel.
1. Press escape.

Expected results:
The delete button should stay visible and be focused.

Actual results:
Focus is lost and the delete button disappears.

This is probably a regression from #3083. Maybe we need an `onWillClose` notification so that focus can be moved before the panel is fully closed.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-415)