Add filtered searchbar to Roadmap page

ee/app/assets/javascripts/pages/groups/roadmap/show/index.js

+import initFilteredSearch from '~/pages/search/init_filtered_search';
+import FilteredSearchTokenKeysEpics from 'ee/filtered_search/filtered_search_token_keys_epics';
 import initNewEpic from 'ee/epics/new_epic/new_epic_bundle';
 import initRoadmap from 'ee/roadmap/index';
 
 document.addEventListener('DOMContentLoaded', () => {
+  initFilteredSearch({
+    page: 'epics',
+    isGroup: true,
+    isGroupDecendent: true,
+    filteredSearchTokenKeys: FilteredSearchTokenKeysEpics,
+    stateFiltersSelector: '.epics-state-filters',
+  });
   initNewEpic();
   initRoadmap();
 });

ee/app/views/groups/roadmap/show.html.haml

@@ -5,6 +5,8 @@
 - breadcrumb_title _("Epics Roadmap")
 
 - if @epics_count != 0
+  = render 'shared/epic/search_bar', type: :epics, hide_sort_dropdown: true
+
   #js-roadmap{ data: { epics_path: group_epics_path(@group, format: :json), group_id: @group.id, empty_state_illustration: image_path('illustrations/epics/roadmap.svg') } }
 - else
   = render 'shared/empty_states/roadmap'