Foreman » Installer

Fixes #26538 - return true if the user is not member of the group

Fixes #26256 - Fix proxy cert generation hooks

When merging the installers, the hooks were removed from the certificate
generation process because most hooks are irrelevant. Not all, so this
caused a regression.

Rather than enabling all hooks again, this takes the more minimal route...

Fixes #26111 - Remove usage of katello-service

katello-service is deprecated in favor of foreman-maintain.

Refs #25839 - Avoid storing puppetserver related versions

Refs #25170 - Use new parameter names in post install

db078f01d41bd2e7898ac79ba1517fca63a6371a omitted this part.

Fixes #25740 - Use strings for user and group

Fixes #25740 - Ensure a user is a member when removing

When a user is not part of a group, the removal fails. Because this is
the desired end state, the upgrade should not fail on that.

Fixes #25697 - Add katello and foreman-proxy-content scenarios