Drop torchair (#4814)

aclgraph is stable and fast now. Let's drop torchair graph mode now.

TODO: some logic to adapt torchair should be cleaned up as well. We'll
do it in the following PR.

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>
Co-authored-by: Mengqing Cao <cmq0113@163.com>

tests/e2e/nightly/features/test_mtpx_deepseek_r1_0528_w8a8.py

@@ -73,7 +73,6 @@ async def test_models(model: str, mode: str) -> None:
         "VLLM_RPC_TIMEOUT": "3600000",
         "VLLM_EXECUTE_MODEL_TIMEOUT_SECONDS": "3600000"
     }
-    additional_config: dict[str, Any] = {}
     speculative_config = {"num_speculative_tokens": 2, "method": "mtp"}
     compilation_config = {
         "cudagraph_capture_sizes": [56],
@@ -104,7 +103,6 @@ async def test_models(model: str, mode: str) -> None:
             ["--speculative-config",
              json.dumps(speculative_config)])
         server_args.extend(["--gpu-memory-utilization", "0.92"])
-        additional_config["torchair_graph_config"] = {"enabled": True}
         aisbench_cases = aisbench_gsm8k
     if mode == "mtp3":
         env_dict["HCCL_OP_EXPANSION_MODE"] = "AIV"
@@ -117,9 +115,7 @@ async def test_models(model: str, mode: str) -> None:
         server_args.extend(
             ["--compilation-config",
              json.dumps(compilation_config)])
-        additional_config["torchair_graph_config"] = {"enabled": False}
         aisbench_cases = aisbench_aime
-    server_args.extend(["--additional-config", json.dumps(additional_config)])
     request_keyword_args: dict[str, Any] = {
         **api_keyword_args,
     }

tests/e2e/nightly/features/test_prefix_cache_deepseek_r1_0528_w8a8.py

@@ -74,13 +74,6 @@ async def test_models(model: str) -> None:
         "PYTORCH_NPU_ALLOC_CONF": "expandable_segments:True",
     }
     additional_config = {
-        "torchair_graph_config": {
-            "enabled": True,
-            "enable_multistream_moe": False,
-            "enable_multistream_mla": True,
-            "graph_batch_size": [16],
-            "use_cached_graph": True
-        },
         "chunked_prefill_for_mla": True,
         "enable_weight_nz_layout": True
     }