[tests] make cuda-only tests device-agnostic (#35607)

* intial commit

* remove unrelated files

* further remove

* Update test_trainer.py

* fix style

tests/models/mistral/test_modeling_mistral.py

@@ -424,7 +424,7 @@ class MistralModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMi
         self.skipTest(reason="Mistral flash attention does not support right padding")
 
 
-@require_torch_gpu
+@require_torch_accelerator
 class MistralIntegrationTest(unittest.TestCase):
     # This variable is used to determine which CUDA device are we using for our runners (A10 or T4)
     # Depending on the hardware we get different logits / generations