repl: Create action to refresh kernelspecs (#14786)

Adds a command to refresh kernelspecs. Also added the kernelspecs to the
runtime panel when none are running. That's just for now until we move
out of the panel completely.

Release Notes:

- N/A
be4b19babbKyle Kelley committed on 7/19/2024, 2:42:18 PM· committed by GitHubparent272be98
1 file changedLine totals unavailable