Gamification code is currently using ``message_post_with_view`` a bit weirdly
* on a not mail-thread enabled record (using model / res_id propagated to
composer which allows it);
* using mass mail composition mode (aka creating directly mail.mail);
* based on a template;
This is basically achieved with ``template.send_mail()`` method.
Task-2710804 (Mail: Clean MailThread API)
Part-of: odoo/odoo#100137