[FIX] base, mail: properly annotate Partner.find_or_create

In 6e25a510b3 `find_or_create` was
modified to return a recordset rather than just an id. This made it
incompatible with the RPC protocol and it was not annotated to
downgrade the return value back to an id.

Fixes odoo/odoo#54466

closes odoo/odoo#54476

X-original-commit: a7e3894e20207b714cebefa908be090967866791
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

addons/mail/models/res_partner.py

@@ -39,6 +39,7 @@ class Partner(models.Model):
             for r in self}
 
     @api.model
+    @api.returns('self', lambda value: value.id)
     def find_or_create(self, email, assert_valid_email=False):
         """ Override to use the email_normalized field. """
         if not email:

odoo/addons/base/models/res_partner.py

@@ -806,6 +806,7 @@ class Partner(models.Model):
         return super(Partner, self)._name_search(name, args, operator=operator, limit=limit, name_get_uid=name_get_uid)
 
     @api.model
+    @api.returns('self', lambda value: value.id)
     def find_or_create(self, email, assert_valid_email=False):
         """ Find a partner with the given ``email`` or use :py:method:`~.name_create`
         to create a new one.