Move taxonomy related methods and scopes to Host::Base
Host::Base already deals with taxonomies, but for some reason we define default_scope and other essential taxonomies related methods in Host::Manage descendant class. That can easy lead to duplication and out of sync of other inheriting classes in plugins (e.g. discovery). We should move all taxonomy related code that is not specific for Host::Manage to Host::Base.
Fixes #10025 - move generic taxonomies code to base class
(cherry picked from commit bf75590c49c05dd780df388908598c85fc8f53bd)