Resolve "OembedView: unable to guess serializer. This is graceful fallback handling for APIViews. Consider using GenericAPIView as view base class, if view is under your control. Ignoring view for now."

This reverts commit 00376930

Closes #1896

Resolve "ChannelViewSet: exception raised while getting serializer. Hint: Is get_serializer_class() returning None or is get_queryset() not working without a request? Ignoring the view for now. (Exception: 'NoneType' object is not callable)"

Resolve "using @extend_schema on viewset class ListenViewSet with parameters operation_id or operation will most likely result in a broken schema."