Fix file finder menu actions (#21087)

Closes https://github.com/zed-industries/zed/issues/21077

* BREAKING: rename `file_finder::OpenMenu` into
`file_finder::ToggleMenu`
* Display the keybinding for menu toggling when the menu is open
* Fix `enter` not working in the menu

Release Notes:

- Fixed enter not working and menu toggle binding not shown in the file
finder menu

crates/ui/src/components/keybinding.rs

@@ -3,7 +3,7 @@ use crate::PlatformStyle;
 use crate::{h_flex, prelude::*, Icon, IconName, IconSize};
 use gpui::{relative, Action, FocusHandle, IntoElement, Keystroke, WindowContext};
 
-#[derive(IntoElement, Clone)]
+#[derive(Debug, IntoElement, Clone)]
 pub struct KeyBinding {
     /// A keybinding consists of a key and a set of modifier keys.
     /// More then one keybinding produces a chord.