Fixes #31213 - hostgroup API facets extension point (#8115)

• Fixes #31213 - hostgroup API facets extension point

Adds Facet extension points for Hostgroup API responses.
Refactor refresh for facets, to ensure all run just once.

Now the already registered entries are being run once the facet entry point is configured....

fixes #3763 - extend rabl templates

Fixes #13079 - Conditionally hide the pagelets