Issue #3085264 by eric.napier, phenaproxima: Merge media_test_filter and media_test_ckeditor

.../modules/media_test_ckeditor/media_test_ckeditor.info.yml

.../tests/modules/media_test_embed/media_test_embed.info.yml

...ia/tests/modules/media_test_embed/media_test_embed.module

...ts/modules/media_test_embed/media_test_embed.services.yml

...a_test_embed/src/Controller/TestMediaFilterController.php

.../modules/media_test_embed/src/Routing/RouteSubscriber.php

.../tests/modules/media_test_filter/media_test_filter.module

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

...s/src/Kernel/MediaEmbedFilterDisabledIntegrationsTest.php

core/modules/media/tests/src/Kernel/MediaEmbedFilterTest.php