Issue #3093185 by chr.fritsch: Remove media.module BC layers

core/modules/media/media.routing.yml

core/modules/media/src/Entity/Media.php

...modules/media/src/Form/MediaDeleteMultipleConfirmForm.php

core/modules/media/src/MediaSourceInterface.php

core/modules/media/src/Plugin/media/Source/OEmbed.php

...rc/Functional/MediaFunctionalTestCreateMediaTypeTrait.php

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

...modules/media/tests/src/Traits/MediaTypeCreationTrait.php