Move git status out of Entry (#22224)

- [x] Rewrite worktree git handling
- [x] Fix tests
- [x] Fix `test_propagate_statuses_for_repos_under_project`
- [x] Replace `WorkDirectoryEntry` with `WorkDirectory` in
`RepositoryEntry`
- [x] Add a worktree event for capturing git status changes
- [x] Confirm that the local repositories are correctly updating the new
WorkDirectory field
- [x] Implement the git statuses query as a join when pulling entries
out of worktree
- [x] Use this new join to implement the project panel and outline
panel.
- [x] Synchronize git statuses over the wire for collab and remote dev
(use the existing `worktree_repository_statuses` table, adjust as
needed)
- [x] Only send changed statuses to collab

Release Notes:

- N/A

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.com>
Co-authored-by: Nathan <nathan@zed.dev>

crates/sum_tree/src/cursor.rs

@@ -9,6 +9,15 @@ struct StackEntry<'a, T: Item, D> {
     position: D,
 }
 
+impl<'a, T: Item + fmt::Debug, D: fmt::Debug> fmt::Debug for StackEntry<'a, T, D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("StackEntry")
+            .field("index", &self.index)
+            .field("position", &self.position)
+            .finish()
+    }
+}
+
 #[derive(Clone)]
 pub struct Cursor<'a, T: Item, D> {
     tree: &'a SumTree<T>,
@@ -18,6 +27,21 @@ pub struct Cursor<'a, T: Item, D> {
     at_end: bool,
 }
 
+impl<'a, T: Item + fmt::Debug, D: fmt::Debug> fmt::Debug for Cursor<'a, T, D>
+where
+    T::Summary: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Cursor")
+            .field("tree", &self.tree)
+            .field("stack", &self.stack)
+            .field("position", &self.position)
+            .field("did_seek", &self.did_seek)
+            .field("at_end", &self.at_end)
+            .finish()
+    }
+}
+
 pub struct Iter<'a, T: Item> {
     tree: &'a SumTree<T>,
     stack: ArrayVec<StackEntry<'a, T, ()>, 16>,
@@ -60,6 +84,7 @@ where
         }
     }
 
+    /// Item is None, when the list is empty, or this cursor is at the end of the list.
     #[track_caller]
     pub fn item(&self) -> Option<&'a T> {
         self.assert_did_seek();