Follow up to #31179 

In addition to seeing the version when in the `Click to restart and
update Zed` status, this PR allows us to see the version when in
`Downloading Zed update…` or `Installing Zed update…` status, in a
tooltip, when hovering on the activity indicator.

Will merge after tomorrow's release.

Release Notes:

- Added version information, in a tooltip, when hovering on the activity
indicator for both the download and install status.