Refactor issue index filtered search

app/assets/javascripts/pages/search/init_filtered_search.js

+import '~/filtered_search/dropdown_emoji';
+import '~/filtered_search/dropdown_hint';
+import '~/filtered_search/dropdown_non_user';
+import '~/filtered_search/dropdown_user';
+import '~/filtered_search/dropdown_utils';
+import '~/filtered_search/filtered_search_dropdown_manager';
+import '~/filtered_search/filtered_search_dropdown';
+import '~/filtered_search/filtered_search_manager';
+import '~/filtered_search/filtered_search_tokenizer';
+import '~/filtered_search/filtered_search_visual_tokens';
+
 export default ({ page }) => {
   const filteredSearchEnabled = gl.FilteredSearchManager && document.querySelector('.filtered-search');
   if (filteredSearchEnabled) {

app/views/projects/issues/index.html.haml

@@ -6,7 +6,6 @@
 
 - content_for :page_specific_javascripts do
   = webpack_bundle_tag 'common_vue'
-  = webpack_bundle_tag 'filtered_search'
 
 = content_for :meta_tags do
   = auto_discovery_link_tag(:atom, params.merge(rss_url_options), title: "#{@project.name} issues")