Fix right click handler for tabs

Also, some fun test helpers

Co-Authored-By: Mikayla <mikayla@zed.dev>

crates/ui/src/components/context_menu.rs

@@ -303,6 +303,7 @@ impl Render for ContextMenu {
                                         .w_full()
                                         .justify_between()
                                         .child(label_element)
+                                        .debug_selector(|| format!("MENU_ITEM-{}", label))
                                         .children(action.as_ref().and_then(|action| {
                                             KeyBinding::for_action(&**action, cx)
                                                 .map(|binding| div().ml_1().child(binding))