put the "temporary_class" for the metaclass hack into adhoc module

it's a part of the campaign to get rid of non-module roots

astroid/nodes/scoped_nodes/scoped_nodes.py

@@ -1624,7 +1624,7 @@ def infer_call_result(
                     col_offset=0,
                     end_lineno=0,
                     end_col_offset=0,
-                    parent=self,
+                    parent=AstroidManager().adhoc_module,
                 )
                 new_class.hide = True
                 new_class.postinit(