Add refresh button into MR widget failed state.

Added a Refresh button to auto merge failed state in the MR widget which will allow user to manually refresh the widget.

Fixes #32543 (closed)

app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_auto_merge_failed.js

@@ -40,7 +40,7 @@ export default {
           Refresh
         </button>
       </span>
-      <div class="merge-error-text">
+      <div class="merge-error-text danger bold">
         {{mr.mergeError}}
       </div>
     </div>