When using the mail composer in comment mode on models that do not inherit
from mail.thread, the post is transformed into notification process. Instead
of calling 'message_post' on the records (which would crash) 'message_notify'
is called, using MailThread as abstract class (which creates notifications
without having to inherit from mail.thread).
However some parameters from the composer are not supported when calling
'message_notify'. This commit fixes it and adds tests accordingly.
Followup of odoo/odoo#99482
Task-2710804 (Mail: Clean MailThread API)
Part-of: odoo/odoo#107356