Background
Transient (new) host parameters associated with the host are not rendered
in the template check action nor in the 'Orchestration:Templates' queue.

This behavior causes issues for image-based provisioning when the activation key
is defined on the host level, rather than on the hostgroup.

• 'host_param' macro now renders all host parameters
• 'hosts#template_used' action now renders templates with all host parameters
• 'Orchestration::Templates' now renders templates with all host parameters

• Community RFC: https://community.theforeman.org/t/provisioning-hosts-doesnt-work-well-with-host-parameters/44334
• Original ticket: https://projects.theforeman.org/issues/38422#