Fixes #36430 - Get arch restriction data from all repos, not just those with URL

[jeremylenz]

What are the changes introduced in this pull request?

On the Repository Sets tab, the arch restriction label ("x86_64" in the image above) was based on

pc.repositories&.first&.arch

(where pc is a Katello::ProductContent).

pc.repositories runs the query

def repositories
      Katello::Repository.in_default_view.where(:root_id => product.root_repositories.has_url.where(:content_id => content.cp_content_id))
end

Because of the has_url, pc.repositories will not return any repository that doesn't have a URL. So if you have a product with an empty repository, or a repository that doesn't yet have an Upstream URL set, pc.repositories would return [], meaning the arch restriction label would not be properly displayed.

With this change, the query doesn't filter out any repositories, thus allowing a correct arch restriction label in the UI.

Considerations taken when implementing this change?

Originally the new query was using pc.product.root_repositories.first but I realized that would cause an incorrect arch restriction label if you had more than one repo in your product.

What are the testing steps for this pull request?

Create custom products with repos that don't have an upstream URL
Restrict the architecture on one of these repos, but leave the other unrestricted
Verify that the arch restriction label shows up correctly on all custom repos.

[theforeman-bot]

Issues: #36430

[jeremylenz]

Updated to handle the case where a product has >1 repo.

ready for review

[jeremylenz]

@lfu Updated.

[lfu]

Nice work!