Debounce language server file system events (#30773)

This helps prevent a race condition where the language server would
update in the middle of a `git checkout`

Release Notes:

- N/A

crates/project/src/project_tests.rs

@@ -1,8 +1,8 @@
 #![allow(clippy::format_collect)]
 
 use crate::{
-    Event, git_store::StatusEntry, task_inventory::TaskContexts, task_store::TaskSettingsLocation,
-    *,
+    Event, git_store::StatusEntry, lsp_store::FS_WATCH_DEBOUNCE_TIMEOUT,
+    task_inventory::TaskContexts, task_store::TaskSettingsLocation, *,
 };
 use buffer_diff::{
     BufferDiffEvent, CALCULATE_DIFF_TASK, DiffHunkSecondaryStatus, DiffHunkStatus,
@@ -1190,6 +1190,9 @@ async fn test_reporting_fs_changes_to_language_servers(cx: &mut gpui::TestAppCon
 
     // The language server receives events for the FS mutations that match its watch patterns.
     cx.executor().run_until_parked();
+    cx.executor().advance_clock(FS_WATCH_DEBOUNCE_TIMEOUT);
+    cx.executor().run_until_parked();
+
     assert_eq!(
         &*file_changes.lock(),
         &[