When a linked worktree receives fs events for its .git directory, the
event path resolves to the per-worktree git dir (e.g.
main_repo/.git/worktrees/<name>), not the .git directory itself or the
common dir. The existing match only checked common_dir_abs_path and
repository_dir_abs_path, causing the repository entry to be missed and
then removed as stale.

Add dot_git_abs_path to the match, and fix the staleness metadata check
to use dot_git_abs_path (the actual .git entry) rather than
common_dir_abs_path (which may be outside the worktree root).

Extracted from https://github.com/zed-industries/zed/pull/53453

Release Notes:

- N/A or Added/Fixed/Improved ...

---------

Co-authored-by: Kieran Freitag <kfreitag@kieran.ca>
Co-authored-by: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>