Issue #3421480 by Spokje, longwave, andypost: Convert OpenerResolver to use a service locator

core/modules/media_library/media_library.services.yml

...modules/media_library/src/MediaLibraryServiceProvider.php

core/modules/media_library/src/OpenerResolver.php

...edia_library/tests/src/Kernel/MediaLibraryAddFormTest.php

...media_library/tests/src/Kernel/MediaLibraryWidgetTest.php

core/phpstan-baseline.neon