[test_models_transformer_ltx.py] help us test torch.compile() for impactful models (#11512)

* Update test_models_transformer_ltx.py

* Update test_models_transformer_ltx.py

* Update test_models_transformer_ltx.py

* Update test_models_transformer_ltx.py

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

tests/models/transformers/test_models_transformer_ltx.py

@@ -20,13 +20,13 @@ import torch
 from diffusers import LTXVideoTransformer3DModel
 from diffusers.utils.testing_utils import enable_full_determinism, torch_device
 
-from ..test_modeling_common import ModelTesterMixin
+from ..test_modeling_common import ModelTesterMixin, TorchCompileTesterMixin
 
 
 enable_full_determinism()
 
 
-class LTXTransformerTests(ModelTesterMixin, unittest.TestCase):
+class LTXTransformerTests(ModelTesterMixin, TorchCompileTesterMixin, unittest.TestCase):
     model_class = LTXVideoTransformer3DModel
     main_input_name = "hidden_states"
     uses_custom_attn_processor = True