Fix permalink-to-line when Git repo root and worktree dir don't coincide (#22003)

Closes #21505. This should work if the git dir is an ancestor of the
worktree dir or vice versa.

Release Notes:

- Fixed GitHub permalink-to-line actions when worktree dir and Git dir
aren't the same

crates/worktree/src/worktree.rs

@@ -2396,7 +2396,6 @@ impl Snapshot {
             .map(|(path, entry)| (&path.0, entry))
     }
 
-    /// Get the repository whose work directory contains the given path.
     pub fn repository_for_work_directory(&self, path: &Path) -> Option<RepositoryEntry> {
         self.repository_entries
             .get(&RepositoryWorkDirectory(path.into()))