Merge branch 'winh-namespace-select-dropdown' into 'master'

Make namespace select dropdowns consistent

See merge request !13626

app/assets/stylesheets/framework/dropdowns.scss

@@ -797,3 +797,5 @@
     margin-top: 2px;
   }
 }
+
+@include new-style-dropdown('.js-namespace-select + ');