Git activity indicator (#28204)

Closes #26182

Release Notes:

- Added an activity indicator for long-running git commands.

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/editor/src/git/blame.rs

@@ -436,7 +436,9 @@ impl GitBlame {
         }
         let buffer_edits = self.buffer.update(cx, |buffer, _| buffer.subscribe());
         let snapshot = self.buffer.read(cx).snapshot();
-        let blame = self.project.read(cx).blame_buffer(&self.buffer, None, cx);
+        let blame = self.project.update(cx, |project, cx| {
+            project.blame_buffer(&self.buffer, None, cx)
+        });
         let provider_registry = GitHostingProviderRegistry::default_global(cx);
 
         self.task = cx.spawn(async move |this, cx| {