Rating page is broken since migration to bootstrap5. This commit fixes various issues linked to btn-group, display and usage of group checkboxes. Overall html structure is cleaned and bootstrap 5 rules are applied. Some small display improvements are also applied to the rating email. Task-2207626 (Rating: Log ratings, post feedbacks) Part-of: odoo/odoo#95623 Co-authored-by: Adrien Dieudonné <adr@odoo.com>