More robust tied weight test (#39681)

* Update test_modeling_common.py

* remove old ones

* Update test_modeling_common.py

* Update test_modeling_common.py

* add

* Update test_modeling_musicgen_melody.py

tests/models/pix2struct/test_modeling_pix2struct.py

@@ -656,10 +656,6 @@ class Pix2StructModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTeste
             # Check that the model can still do a forward pass successfully (every parameter should be resized)
             model(**self._prepare_for_class(inputs_dict, model_class))
 
-    @unittest.skip(reason="Pix2Struct doesn't use tied weights")
-    def test_tied_model_weights_key_ignore(self):
-        pass
-
     def _create_and_check_torchscript(self, config, inputs_dict):
         if not self.test_torchscript:
             self.skipTest(reason="test_torchscript is set to False")