v2.11.0-alpha7

 Accessibility tests (#12900)

* WIP: Accessibility e2e test suite and support

* Add e2e job for accessibility tests

* Fix a11y tests

* Remove test

* Fix lint issues

* Add report upload

* Upload a11y screenshots

* Remove failure gate on a11y screenshots

* Test debugging

* Fix lint

* Fix setup issue

* Tweak tests

* Create a11y report

* Fix screenshot folder

* Build out more tests to cover a11y