Merge branch '36325-increase-z-index-pipeline-dropdown' into 'master'

Increase z-index of pipeline dropdown

Closes #36325

See merge request !13507

app/assets/stylesheets/pages/pipelines.scss

@@ -824,6 +824,7 @@ button.mini-pipeline-graph-dropdown-toggle {
  * Top arrow in the dropdown in the mini pipeline graph
  */
 .mini-pipeline-graph-dropdown-menu {
+  z-index: 200;
 
   &::before,
   &::after {