Fix some syncing issues with git statuses (#25535)

Like the real app, this one infinite loops if you have a diff in an
UnsharedFile.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/project/src/git.rs

@@ -88,6 +88,7 @@ pub enum Message {
     Fetch(GitRepo),
 }
 
+#[derive(Debug)]
 pub enum GitEvent {
     ActiveRepositoryChanged,
     FileSystemUpdated,