Revert "Move git status updates to a background thread (#24307)" (#24415)

This reverts commit 980ce5fbf2.

Release Notes:

- N/A

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/worktree/src/worktree_tests.rs

@@ -24,7 +24,6 @@ use std::{
     mem,
     path::{Path, PathBuf},
     sync::Arc,
-    time::Duration,
 };
 use util::{test::TempTree, ResultExt};
 
@@ -1505,7 +1504,6 @@ async fn test_bump_mtime_of_git_repo_workdir(cx: &mut TestAppContext) {
         &[(Path::new("b/c.txt"), StatusCode::Modified.index())],
     );
     cx.executor().run_until_parked();
-    cx.executor().advance_clock(Duration::from_secs(1));
 
     let snapshot = tree.read_with(cx, |tree, _| tree.snapshot());