Merge branch '352308-labels-in-epic-activity-history-have-broken-links' into 'master'

Fixed bug without [] in label url

See merge request gitlab-org/gitlab!80227

ee/app/assets/javascripts/roadmap/mixins/filtered_search_mixin.js

@@ -219,7 +219,7 @@ export default {
         });
       }
 
-      if (labelName?.length) {
+      if (labelName?.length && Array.isArray(labelName)) {
         filteredSearchValue.push(
           ...labelName.map((label) => ({
             type: 'label_name',