Don't show Red Hat repositories button for Debian hosts
On the new host details page Repository sets and Module streams tabs, if a user doesn't have any, the empty state has a link to 'Red Hat repositories' as a primary action and 'Create custom product' as a secondary action.
For non-RHEL users, this is not relevant. 'Create custom product' should be the primary and only action.
- use host details operatingsystem_name value to determine host OS
original GH discussion at https://github.com/Katello/katello/pull/10144#issuecomment-1149099245