test_lists: improve test readability (part 3)

Replicates graphql/graphql-js@842eeef

Author: Cito

src/graphql/error/graphql_error.py

@@ -154,14 +154,17 @@ def __eq__(self, other: Any) -> bool:
             isinstance(other, GraphQLError)
             and self.__class__ == other.__class__
             and all(
-                getattr(self, slot) == getattr(other, slot) for slot in self.__slots__
+                getattr(self, slot) == getattr(other, slot)
+                for slot in self.__slots__
+                if slot != "original_error"
             )
         ) or (
             isinstance(other, dict)
             and "message" in other
             and all(
                 slot in self.__slots__ and getattr(self, slot) == other.get(slot)
                 for slot in other
+                if slot != "original_error"
             )
         )