Add Browserstack for IE11 testing (#6557)

* add browserstack

* check for data before removing root token

* fix root prefix and select by attributes for ie11

* use objectAt for ie11

* use blobs instead of files for ie11

* manually round cirucmference for ie11

* skip csp test on ie11

* skip tests in ie11

* include polyfill for CI

* remove on exit hooks

* update which browserstack tests are run

* remove ie check since we are not running these tests in ie

* remove ie check since we are not running these tests in ie

ui/tests/integration/components/auth-jwt-test.js

@@ -51,6 +51,8 @@ const OIDC_AUTH_RESPONSE = {
   },
 };
 
+const WAIT_TIME = 50;
+
 const routerStub = Service.extend({
   urlFor() {
     return 'http://example.com';