Revert "gpui: Flash menu in menubar on macOS when action is triggered (#38588)" (#38880)

This reverts commit ed7bd5a8ed.

We noticed this PR causes the editor to hang if you hold down any of the
menu item actions like ctrl+z, ctrl+x, etc


Release Notes:

- Fixed macOS menu item actions hanging the editor when their key
combination is held down

crates/gpui/src/platform/linux/platform.rs

@@ -442,8 +442,6 @@ impl<P: LinuxClient + 'static> Platform for P {
         });
     }
 
-    fn on_action_triggered(&self, _action: &dyn Action) {}
-
     fn app_path(&self) -> Result<PathBuf> {
         // get the path of the executable of the current process
         let app_path = env::current_exe()?;