Git Panel push feedback (progress spinner) during long-running operations

[NoTuxNoBux]

During a long-running initial git push using the GitPanel, no loading spinner is shown whilst this is happening. I couldn't monitor whether it succeeded, failed, or was still busy without resorting to a ps aux | grep git or similar.

It ended up finishing a minute or so later successfully, at which point Zed still said nothing. The button to push that initially said '1 commit' already showed 'Republish' even before the push was fully done.