In this commit we prepare future event model changes by reordering removing
unnecessary parameters definitions, notably readonly set to False as it is
the default value. Those parameters notably come from 412ff994f1 .
Some reordering is also done in order to better understand future pre / post
change model organization.
LINKS
Task ID 2177281 (support tickets directly in event)
Prepares Community PR odoo/odoo#43488
Closes Community PR odoo/odoo#44066