refactor(deprecation): subject_relations() has been inlined

cubicweb_compound/entities.py

@@ -45,7 +45,7 @@ def copy_entity(original, cw_skip_copy_for=None, **attributes):
     """
     attrs = attributes.copy()
     original.complete()
-    for rschema in original.e_schema.subject_relations():
+    for rschema in original.e_schema.subject_relations.values():
         if (not rschema.final or rschema.meta
                 or (rschema.type, 'subject') in original.cw_skip_copy_for):
             continue