[FIX] core: avoid 'Registry' object has no attribute '_m2m' error

If `setup_models` is called concurrently,
the first one just delete the `registry._m2m`.
then the latter one tries to access `registry._m2m`.
An error 'Registry' object has no attribute '_m2m' will be raised

This commit add a lock to the `setup_model` to fix the problem

X-original-commit: 9ae78193f5c9ae4dcfa28c4ea4be1a7f98e42136
Part-of: odoo/odoo#146544

odoo/modules/registry.py

@@ -273,6 +273,7 @@ class Registry(Mapping):
 
         return self.descendants(model_names, '_inherit', '_inherits')
 
+    @locked
     def setup_models(self, cr):
         """ Complete the setup of models.
             This must be called after loading modules and before using the ORM.