cx.background_executor().spawn(...) -> cx.background_spawn(...) (#25103)

Done automatically with

> ast-grep -p '$A.background_executor().spawn($B)' -r
'$A.background_spawn($B)' --update-all --globs "\!crates/gpui"

Followed by:

* `cargo fmt`
* Unexpected need to remove some trailing whitespace.
* Manually adding imports of `gpui::{AppContext as _}` which provides
`background_spawn`
* Added `AppContext as _` to existing use of `AppContext`

Release Notes:

- N/A

crates/worktree/src/worktree_tests.rs

@@ -11,7 +11,7 @@ use git::{
     },
     GITIGNORE,
 };
-use gpui::{BorrowAppContext, Context, Task, TestAppContext};
+use gpui::{AppContext as _, BorrowAppContext, Context, Task, TestAppContext};
 use parking_lot::Mutex;
 use postage::stream::Stream;
 use pretty_assertions::assert_eq;
@@ -1954,7 +1954,7 @@ fn randomly_mutate_worktree(
                 new_path
             );
             let task = worktree.rename_entry(entry.id, new_path, cx);
-            cx.background_executor().spawn(async move {
+            cx.background_spawn(async move {
                 task.await?.to_included().unwrap();
                 Ok(())
             })
@@ -1969,7 +1969,7 @@ fn randomly_mutate_worktree(
                     child_path,
                 );
                 let task = worktree.create_entry(child_path, is_dir, cx);
-                cx.background_executor().spawn(async move {
+                cx.background_spawn(async move {
                     task.await?;
                     Ok(())
                 })
@@ -1977,7 +1977,7 @@ fn randomly_mutate_worktree(
                 log::info!("overwriting file {:?} ({})", entry.path, entry.id.0);
                 let task =
                     worktree.write_file(entry.path.clone(), "".into(), Default::default(), cx);
-                cx.background_executor().spawn(async move {
+                cx.background_spawn(async move {
                     task.await?;
                     Ok(())
                 })