Investigate ways to prevent syncs from failing when artifact download links return 404 or are invalid.

[gerrod3]

Currently both roles and collection syncs will fail if an artifact's download link is broken/missing. With Collections we have minimum ability to avoid this issue by using a requirements file [0], but this is still a very inconvenient way for a user to bypass a bad collection.

Options:

• Add ability to exclude roles/collections from their remotes
• Add sync param to skip over content that have bad links (lots of design questions around this one, potential for work in pulpcore)
• Leave as is and try to inform upstream remotes when their links are broken.

[0] https://docs.pulpproject.org/pulp_ansible/restapi.html#tag/Remotes:-Collection/operation/remotes_ansible_collection_create