Increase timeout for abuse_reports_spec.js to 500ms

spec/frontend/pages/admin/abuse_reports/abuse_reports_spec.js

 import $ from 'jquery';
 import '~/lib/utils/text_utility';
 import AbuseReports from '~/pages/admin/abuse_reports/abuse_reports';
+import { setTestTimeout } from 'helpers/timeout';
+
+setTestTimeout(500);
 
 describe('Abuse Reports', () => {
   const FIXTURE = 'abuse_reports/abuse_reports_list.html';