Add Code Actions to the Toolbar (#31236)

Closes issue #31120.


https://github.com/user-attachments/assets/a4b3c86d-7358-49ac-b8d9-e9af50daf671

Release Notes:

- Added a code actions icon to the toolbar. This icon can be disabled by
setting `toolbar.code_actions` to `false`.

crates/editor/src/editor_tests.rs

@@ -14243,7 +14243,7 @@ async fn test_context_menus_hide_hover_popover(cx: &mut gpui::TestAppContext) {
     cx.update_editor(|editor, window, cx| {
         editor.toggle_code_actions(
             &ToggleCodeActions {
-                deployed_from_indicator: None,
+                deployed_from: None,
                 quick_launch: false,
             },
             window,