Merge branch '50281-js-pages-do-not-load-on-windows-8-ie-11' into 'master'

Resolve "JS Pages do not load on windows 8, IE 11"

Closes #50281

See merge request gitlab-org/gitlab-ce!21214

app/assets/javascripts/commons/polyfills.js

@@ -8,6 +8,7 @@ import 'core-js/fn/object/assign';
 import 'core-js/fn/promise';
 import 'core-js/fn/string/code-point-at';
 import 'core-js/fn/string/from-code-point';
+import 'core-js/fn/string/includes';
 import 'core-js/fn/symbol';
 import 'core-js/es6/map';
 import 'core-js/es6/weak-map';

changelogs/unreleased/50281-js-pages-do-not-load-on-windows-8-ie-11.yml

+---
+title: Fix broken JavaScript in IE11
+merge_request: 21214
+author:
+type: fixed