Merge branch 'winh-pipeline-action-dropdowns' into 'master'

Make pipeline action dropdowns consistent

See merge request !13534

app/assets/stylesheets/framework/dropdowns.scss

@@ -761,6 +761,7 @@
       button,
       .menu-item {
         border-radius: 0;
+        box-shadow: none;
         padding: 8px 16px;
         text-align: left;
         width: 100%;

app/assets/stylesheets/pages/pipelines.scss

@@ -257,6 +257,8 @@
 
 // Pipeline visualization
 .pipeline-actions {
+  @include new-style-dropdown;
+
   border-bottom: none;
 }