[Attention] Update tests to remove deprecated env vars (#30563)

Signed-off-by: Matthew Bonanni <mbonanni@redhat.com>

tests/models/multimodal/generation/test_granite_speech.py

@@ -35,10 +35,12 @@ audio_lora_path = MODEL_NAME
 models = [MODEL_NAME]
 
 
-@pytest.fixture(autouse=True)
-def set_attention_backend_for_rocm(monkeypatch):
+@pytest.fixture
+def granite_speech_attention_config():
+    """Return attention config for Granite Speech tests on ROCm."""
     if current_platform.is_rocm():
-        monkeypatch.setenv("VLLM_ATTENTION_BACKEND", "TRITON_ATTN")
+        return {"backend": "TRITON_ATTN"}
+    return None
 
 
 def run_test(
@@ -53,6 +55,7 @@ def run_test(
     num_logprobs: int,
     tensor_parallel_size: int,
     distributed_executor_backend: str | None = None,
+    attention_config: dict | None = None,
 ):
     """Inference result should be the same between hf and vllm.
 
@@ -80,6 +83,7 @@ def run_test(
         enable_lora=True,
         max_lora_rank=64,
         enforce_eager=True,
+        attention_config=attention_config,
     ) as vllm_model:
         lora_request = LoRARequest("audio", 1, audio_lora_path)
         vllm_outputs_per_case = [
@@ -131,6 +135,7 @@ def test_models(
     vllm_runner,
     model: str,
     audio_assets: AudioTestAssets,
+    granite_speech_attention_config,
     dtype: str,
     max_model_len: int,
     max_tokens: int,
@@ -157,4 +162,5 @@ def test_models(
         max_tokens=max_tokens,
         num_logprobs=num_logprobs,
         tensor_parallel_size=1,
+        attention_config=granite_speech_attention_config,
     )