Closes https://github.com/zed-industries/zed/issues/61182

Supersedes https://github.com/zed-industries/zed/pull/61232

Closes FR-128

Release Notes:

- Fixed crash when closing active item while the workspace was
mid-update (double-lease panic).

Co-authored-by: apoorva-01 <vermaapoorva0510@gmail.com>