Merge branch '235370-iterations-dropdown' into 'master'

Remove broken dropdown code

See merge request gitlab-org/gitlab!49375

ee/app/assets/javascripts/sidebar/components/iteration_select.vue

@@ -191,7 +191,6 @@ export default {
     <gl-dropdown
       v-show="editing"
       ref="newDropdown"
-      data-toggle="dropdown"
       :text="$options.iterationText"
       class="dropdown gl-w-full"
       :class="{ show: editing }"