windows: Dock menu impl 2 (#26010)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

crates/gpui/src/platform.rs

@@ -189,6 +189,7 @@ pub(crate) trait Platform: 'static {
     }
 
     fn set_dock_menu(&self, menu: Vec<MenuItem>, keymap: &Keymap);
+    fn perform_dock_menu_action(&self, _action: usize) {}
     fn add_recent_document(&self, _path: &Path) {}
     fn on_app_menu_action(&self, callback: Box<dyn FnMut(&dyn Action)>);
     fn on_will_open_app_menu(&self, callback: Box<dyn FnMut()>);