[MOV] website_rating: move to portal_rating

PURPOSE

Clean posting process and improve mail.message definition and comprehension.
Move as much possible content from website_* modules to portal_* modules
to ease their use in customer portal

SPECIFICATIONS

Now that publish feature is replaced by internal directly in mail and portal
rating portal inclusion can be done safely in a portal_ratign module instead
of website_rating. It allows to remove the dependency and give the rating
feature of customer chatter directly in portal applications.

LINKS

Task ID 2071556
PR #38692