[MOV] website_rating: rename portal files

PURPOSE

Fix frontend rating and clean a bit module organization

SPECIFICATIONS

In order to ease understanding of portal chatter dependencies let us name
files according to guidelines. In this commit we rename a bit files in
website mail to understand which widgets and portal parts are impacted by
website mail bridge module.

Assets are also moved in their own file to ease module discovering.

LINKS

Task 2057301
PR #35870