[FIX] models: remove set iteration

A set iteration was creating a random number of queries on some tests.
This was noticed in TestEventPerformance were a random additionnal query
 could appear in default_get depending on _get_description and
_get_default_stage_id order.

This commit uses a list to get a deterministic order. It looks like
the set was not useful anyway.

closes odoo/odoo#113563

X-original-commit: 13572df256ccc6351588851d385c381ace155e0d
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>
Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>

odoo/models.py

@@ -1634,16 +1634,16 @@ class BaseModel(metaclass=MetaModel):
             return False
 
         # compute missing fields
-        missing_defaults = {
+        missing_defaults = [
             name
             for name, field in self._fields.items()
             if name not in values
             if not avoid(field)
-        }
+        ]
 
         if missing_defaults:
             # override defaults with the provided values, never allow the other way around
-            defaults = self.default_get(list(missing_defaults))
+            defaults = self.default_get(missing_defaults)
             for name, value in defaults.items():
                 if self._fields[name].type == 'many2many' and value and isinstance(value[0], int):
                     # convert a list of ids into a list of commands