Vcs menu2 (#3648)

Header and footer are gonna be added in a separate PR as they require
changes to Picker trait that I feel are separate from the contents of
this PR.

Release Notes:

- N/A

crates/collab_ui2/src/collab_ui.rs

@@ -34,7 +34,7 @@ pub fn init(app_state: &Arc<AppState>, cx: &mut AppContext) {
     ChatPanelSettings::register(cx);
     NotificationPanelSettings::register(cx);
 
-    // vcs_menu::init(cx);
+    vcs_menu::init(cx);
     collab_titlebar_item::init(cx);
     collab_panel::init(cx);
     channel_view::init(cx);