This reverts #54329 and the part of #52499 that was an earlier attempt
at the same thing, which caused us to incorrectly miss git state updates
on Windows. cc @Veykril it seems like we need to find a different way to
fix the problem of `.git` scanning cycles.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- Fixed a bug causing stale git state on Windows.