Issue #3275807 by danflanagan8, nod_, larowlan: Media Tests should not rely on Classy

...ests/src/FunctionalJavascript/CKEditorIntegrationTest.php

core/modules/media/tests/src/Functional/MediaAccessTest.php

...ules/media/tests/src/Functional/MediaOverviewPageTest.php

...media/tests/src/FunctionalJavascript/MediaDisplayTest.php

...ests/src/FunctionalJavascript/MediaJavascriptTestBase.php

...ts/src/FunctionalJavascript/MediaSourceAudioVideoTest.php

...ia/tests/src/FunctionalJavascript/MediaSourceFileTest.php

...a/tests/src/FunctionalJavascript/MediaSourceImageTest.php

...s/src/FunctionalJavascript/MediaSourceOEmbedVideoTest.php

...sts/src/FunctionalJavascript/MediaStandardProfileTest.php