fix(dashboards): Prevent ESC from blocking confirmation modal dismiss

useHotkeys calls preventDefault before the callback, so when the
confirmation modal is open the event gets swallowed before GlobalModal
can handle it. Use skipPreventDefault and call preventDefault only
when we actually close the slideout.

Author: NicoHinderling

static/app/views/dashboards/widgetBuilder/components/widgetBuilderSlideout.tsx

@@ -240,8 +240,10 @@ export function WidgetBuilderSlideout({
   useHotkeys([
     {
       match: 'Escape',
-      callback: () => {
+      skipPreventDefault: true,
+      callback: (evt: KeyboardEvent) => {
         if (!isModalVisible) {
+          evt.preventDefault();
           onCloseWithModal();
         }
       },