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)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #51340
Release Notes:

- Linux/WSL: Added polling filesystem watching support in order to
support file watching on file systems that do emit events through
`inotify`, for example `/mnt/c` in WSL, network filesystems, and FUSE
mounts. Polling should be automatically chosen over `inotify` when
necessary, however it can be manually chosen by setting the
`ZED_FILE_WATCHER_MODE=poll` env var

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Co-authored-by: Lilith River <lilith@imazen.io>
Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>