[tests] add `require_torch_sdpa` for test that needs sdpa support (#30408)

* add cuda flag

* check for sdpa

* add bitsandbytes

tests/models/cohere/test_modeling_cohere.py

@@ -374,6 +374,7 @@ class CohereModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMix
 @slow
 class CohereIntegrationTest(unittest.TestCase):
     @require_torch_multi_gpu
+    @require_bitsandbytes
     def test_batched_4bit(self):
         model_id = "CohereForAI/c4ai-command-r-v01-4bit"
 
@@ -393,6 +394,7 @@ class CohereIntegrationTest(unittest.TestCase):
         output = model.generate(**inputs, max_new_tokens=40, do_sample=False)
         self.assertEqual(tokenizer.batch_decode(output, skip_special_tokens=True), EXPECTED_TEXT)
 
+    @require_torch_sdpa
     def test_batched_small_model_logits(self):
         # Since the model is very large, we created a random cohere model so that we can do a simple
         # logits check on it.