Add support for git branches on remote projects (#19755)

Release Notes:

- Fixed a bug where the branch switcher could not be used remotely.

crates/worktree/src/worktree.rs

@@ -2385,6 +2385,12 @@ impl Snapshot {
             .map(|entry| entry.to_owned())
     }
 
+    pub fn git_entry(&self, work_directory_path: Arc<Path>) -> Option<RepositoryEntry> {
+        self.repository_entries
+            .get(&RepositoryWorkDirectory(work_directory_path))
+            .map(|entry| entry.to_owned())
+    }
+
     pub fn git_entries(&self) -> impl Iterator<Item = &RepositoryEntry> {
         self.repository_entries.values()
     }