[`core`/ `auto` ] Fix bnb test with code revision + bug with code revision (#26431)

* fix bnb test with code revision

* fix test

* Apply suggestions from code review

* Update src/transformers/models/auto/auto_factory.py

* Update src/transformers/models/auto/auto_factory.py

* Update src/transformers/models/auto/auto_factory.py

tests/quantization/bnb/test_mixed_int8.py

@@ -138,7 +138,9 @@ class MixedInt8Test(BaseMixedInt8Test):
             model_id, trust_remote_code=True, revision="72e5f594ce36f9cabfa2a9fd8f58b491eb467ee7"
         )
         with init_empty_weights():
-            model = AutoModelForCausalLM.from_config(config, trust_remote_code=True)
+            model = AutoModelForCausalLM.from_config(
+                config, trust_remote_code=True, code_revision="72e5f594ce36f9cabfa2a9fd8f58b491eb467ee7"
+            )
         self.assertEqual(get_keys_to_not_convert(model), ["transformer.wte"])
         # without trust_remote_code
         config = AutoConfig.from_pretrained(model_id, revision="72e5f594ce36f9cabfa2a9fd8f58b491eb467ee7")