remove filtered_search bundle from epics page

ee/app/assets/javascripts/pages/groups/epics/index/index.js

-import FilteredSearchManager from '~/filtered_search/filtered_search_manager';
+import initFilteredSearch from '~/pages/search/init_filtered_search';
 import FilteredSearchTokenKeysEpics from 'ee/filtered_search/filtered_search_token_keys_epics';
 
 document.addEventListener('DOMContentLoaded', () => {
-  const filteredSearchEnabled = FilteredSearchManager && document.querySelector('.filtered-search');
-  if (filteredSearchEnabled) {
-    const filteredSearchManager = new FilteredSearchManager({
-      page: 'epics',
-      filteredSearchTokenKeys: FilteredSearchTokenKeysEpics,
-      stateFiltersSelector: '.epics-state-filters',
-    });
-    filteredSearchManager.setup();
-  }
+  initFilteredSearch({
+    page: 'epics',
+    filteredSearchTokenKeys: FilteredSearchTokenKeysEpics,
+    stateFiltersSelector: '.epics-state-filters',
+  });
 });

ee/app/views/groups/epics/index.html.haml

 - page_title "Epics"
-- content_for :page_specific_javascripts do
-  = webpack_bundle_tag 'common_vue'
-  = webpack_bundle_tag 'filtered_search'
 
 .top-area
   = render 'shared/issuable/epic_nav', type: :epics