Extract recentSearchesStorageKeys from FilteredSearchManager

(cherry picked from commit a4d0b2435ff132da9bb238fea95672a6ddfd084d)

app/assets/javascripts/filtered_search/filtered_search_manager.js

 import _ from 'underscore';
 import { getParameterByName, getUrlParamsArray } from '~/lib/utils/common_utils';
 import IssuableFilteredSearchTokenKeys from '~/filtered_search/issuable_filtered_search_token_keys';
+import recentSearchesStorageKeys from 'ee_else_ce/filtered_search/recent_searches_storage_keys';
 import { visitUrl } from '../lib/utils/url_utility';
 import Flash from '../flash';
 import FilteredSearchContainer from './container';
@@ -36,10 +37,11 @@ export default class FilteredSearchManager {
     this.tokensContainer = this.container.querySelector('.tokens-container');
     this.filteredSearchTokenKeys = filteredSearchTokenKeys;
     this.stateFiltersSelector = stateFiltersSelector;
-    this.recentsStorageKeyNames = {
-      issues: 'issue-recent-searches',
-      merge_requests: 'merge-request-recent-searches',
-    };
+
+    const { multipleAssignees } = this.filteredSearchInput.dataset;
+    if (multipleAssignees && this.filteredSearchTokenKeys.enableMultipleAssignees) {
+      this.filteredSearchTokenKeys.enableMultipleAssignees();
+    }
 
     this.recentSearchesStore = new RecentSearchesStore({
       isLocalStorageAvailable: RecentSearchesService.isAvailable(),
@@ -51,7 +53,7 @@ export default class FilteredSearchManager {
     const fullPath = this.searchHistoryDropdownElement
       ? this.searchHistoryDropdownElement.dataset.fullPath
       : 'project';
-    const recentSearchesKey = `${fullPath}-${this.recentsStorageKeyNames[this.page]}`;
+    const recentSearchesKey = `${fullPath}-${recentSearchesStorageKeys[this.page]}`;
     this.recentSearchesService = new RecentSearchesService(recentSearchesKey);
   }
 

app/assets/javascripts/filtered_search/recent_searches_storage_keys.js

+export default {
+  issues: 'issue-recent-searches',
+  merge_requests: 'merge-request-recent-searches',
+};