Backport EE changes to...

Backport EE changes to `app/assets/javascripts/filtered_search/issuable_filtered_search_token_keys.js`

app/assets/javascripts/filtered_search/issuable_filtered_search_token_keys.js

 import FilteredSearchTokenKeys from './filtered_search_token_keys';
-const tokenKeys = [{
+export const tokenKeys = [{
   key: 'author',
   type: 'string',
   param: 'username',
@@ -42,14 +42,14 @@ if (gon.current_user_id) {
   });
 }
-const alternativeTokenKeys = [{
+export const alternativeTokenKeys = [{
   key: 'label',
   type: 'string',
   param: 'name',
   symbol: '~',
 }];
-const conditions = [{
+export const conditions = [{
   url: 'assignee_id=0',
   tokenKey: 'assignee',
   value: 'none',