js: Queue 'later' via MetaLaters

This replaces the meta_later_add() API which used now removed global
singletons under the hood.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2557>

js/ui/workspacesView.js

@@ -860,7 +860,8 @@ class WorkspacesDisplay extends St.Widget {
 
     _onDestroy() {
         if (this._parentSetLater) {
-            Meta.later_remove(this._parentSetLater);
+            const laters = global.compositor.get_laters();
+            laters.remove(this._parentSetLater);
             this._parentSetLater = 0;
         }
     }