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/remote_server/src/remote_editing_tests.rs

@@ -1366,10 +1366,14 @@ async fn test_remote_git_branches(cx: &mut TestAppContext, server_cx: &mut TestA
 
     assert_eq!(&remote_branches, &branches_set);
 
-    cx.update(|cx| repository.read(cx).change_branch(new_branch.to_string()))
-        .await
-        .unwrap()
-        .unwrap();
+    cx.update(|cx| {
+        repository.update(cx, |repository, _cx| {
+            repository.change_branch(new_branch.to_string())
+        })
+    })
+    .await
+    .unwrap()
+    .unwrap();
 
     cx.run_until_parked();
 
@@ -1394,18 +1398,18 @@ async fn test_remote_git_branches(cx: &mut TestAppContext, server_cx: &mut TestA
 
     // Also try creating a new branch
     cx.update(|cx| {
-        repository
-            .read(cx)
-            .create_branch("totally-new-branch".to_string())
+        repository.update(cx, |repo, _cx| {
+            repo.create_branch("totally-new-branch".to_string())
+        })
     })
     .await
     .unwrap()
     .unwrap();
 
     cx.update(|cx| {
-        repository
-            .read(cx)
-            .change_branch("totally-new-branch".to_string())
+        repository.update(cx, |repo, _cx| {
+            repo.change_branch("totally-new-branch".to_string())
+        })
     })
     .await
     .unwrap()