Implement collaborative git manipulations (#23869)

Now commit, stage and unstage can be done both via remote ssh and via
collab (by guests with write access).



https://github.com/user-attachments/assets/a0f5e4e8-01a3-402b-a1f7-f3fc1236cffd


Release Notes:

- N/A

crates/worktree/src/worktree.rs

@@ -1530,11 +1530,6 @@ impl LocalWorktree {
         self.settings.clone()
     }
 
-    pub fn local_git_repo(&self, path: &Path) -> Option<Arc<dyn GitRepository>> {
-        self.local_repo_for_path(path)
-            .map(|local_repo| local_repo.repo_ptr.clone())
-    }
-
     pub fn get_local_repo(&self, repo: &RepositoryEntry) -> Option<&LocalRepositoryEntry> {
         self.git_repositories.get(&repo.work_directory_id)
     }