Parse `./`/`a/`/`b/`-prefixed paths more leniently in the file finder (#31459)

Closes https://github.com/zed-industries/zed/issues/15081
Closes https://github.com/zed-industries/zed/issues/31064

Release Notes:

- Parse `./`/`a/`/`b/`-prefixed paths more leniently in the file finder
6840a4e5bcKirill Bulatov committed on 5/26/2025, 8:38:12 PM· committed by GitHubparent5b320d6
2 files changedLine totals unavailable