Fixes #37499 - clean up unmanaged repositories during host registration

[sbernhard]

[sbernhard]

What are your thoughts about this PR @nofaralfasi / @ares? / @stejskalleos Is this something interesting?

If this is something we want, I would suggest to add a GUI to enable/disable cleaning the not managed repositories.

The clean_unmanaged_repositories snippet could be used during usual host provisioning, too.

[sbernhard]

We already have something in the core: f884bab

The mentioned PR is about removing the repositories which were added during provisioning.

This PR is about removing all repositories which are configured on a host and are not managed by subscription manager. If a host is configured to consume the repositories from foreman/katello and therefore has a subscription-manager registration, we expect to have all repositories maintained by foreman/katello. There should not be any other repository besides the repositories from sub-man.

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