Content Translation does not use EntityOwnerInterface properly

#21 missed a piece of #8.
#8 is the one to use

#20/#21 doesn't make sense, setOwner() isn't return a field that can be set. if the entity implements the necessary interface. Instead it needs to use that field if it exists, and otherwise call setOwner(). See also 📌 Content Translation should use EntityPublishedInterface or the 'published' entity key to determine if it needs to add its 'content_translation_status' field Needs review on BC concerns, this will have an impact on defined field storages.

Also, the problem with this approach is that we lose the check on field translation that \Drupal\content_translation\ContentTranslationMetadataWrapper::setFieldOnlyIfTranslatable() does.

I think #21/#20 does make sense. Paige Bartholomew