Fixes #32100 - Unable to set HostGroup content source to capsule that isn't synced

[ianballou]

Hosts don't validate that the content source and lifecycle environment match, so host groups shouldn't need to either.

To see the validation in action:

1. Load up the foreman console
2. Create a lifecycle environment and a pulp node smart proxy
3. Make a hostgroup (note that if you try to make a mismatched LCE and content source, the hostgroup creation will silently fail. This might be due to a create vs create! situation.)
4. Create a new hostgroup content facet like so:

::Katello::Hostgroup::ContentFacet.create!(hostgroup_id: <hostgroup_id>, kickstart_repository_id: nil, content_source_id: <mismatched_content_source_id>, content_view_id: nil, lifecycle_environment_id: <mismatched_LCE_id>)

5. See the error "The selected content source and lifecycle environment do not match".

[theforeman-bot]

Issues: #32100

[ianballou]

[test katello]

[ianballou]

[test katello]

[chris1984]

ACK, works great!