Merge branch 'ph/fixWidgetBorderTop' into 'master'

Fixes widget sections top border not showing

See merge request gitlab-org/gitlab!62693

app/assets/stylesheets/pages/merge_requests.scss

@@ -107,10 +107,15 @@ $tabs-holder-z-index: 250;
     border-radius: $border-radius-default;
   }
 
+  .mr-widget-section:not(:first-child),
   .mr-widget-footer {
     border-top: solid 1px $border-color;
   }
 
+  .mr-widget-alert-container + .mr-widget-section {
+    border-top: 0;
+  }
+
   .mr-fast-forward-message {
     padding-left: $gl-padding-50;
     padding-bottom: $gl-padding;