[Workspaces] add closing of the module after the Editor is closed. (#34533)

src/modules/Workspaces/WorkspacesEditor/App.xaml.cs

@@ -103,6 +103,7 @@ namespace WorkspacesEditor
             }
 
             Dispose();
+            Environment.Exit(0);
         }
 
         private void OnUnhandledException(object sender, UnhandledExceptionEventArgs args)