The ContainerRepository.content_sets is being deprecated and unmaintained. We must switch to ContainerImage.content_sets.

Before this PR, we used to do following:

• Find all the published, non-deprecated container repositories with particular content_sets.
• Find all the images which are the latest and published in those container repositories.

After this RP, we do following:

• Find all the published, non-deprecated container repositories, no matter what the content_set is.
• Find all the images which are the latest and published in those container repositories and have the particular content_set.

That way, we are using containerImage.content_sets and not using containerRepository.content_sets.