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