In this commit we cleanup server actions model in order to make it a bit
more inlined with current code state of the art.
* add no_create / no_open on technical fields (m2o towards fields notably)
as creating or updating fields on the fly is not the purpose of base
automation module;
* rewrite onchange into compute or constraint methods;
* add compute methods to cleanup data when changing configuration (model or
trigger). Some fields have no usage except in some configuration better
reset their value. Notably fields linked to the chosen model should be
reset;
* add constraints for invalid configuration, notably for models coherency
with mail features;
Task-2613245 (Server actions mail update / cleaning)
Part-of: odoo/odoo#75906
Thibault Delavallée
138ab8ef14