[Test] Remove VLLM_USE_V1 in example and tests (#1733)

V1 is enabled by default, no need to set it by hand now. This PR remove
the useless setting in example and tests

- vLLM version: v0.9.2
- vLLM main:
9ad0a4588b

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

tests/e2e/multicard/test_torchair_graph_mode.py

@@ -22,9 +22,7 @@ Run `pytest tests/multicard/test_torchair_graph_mode.py`.
 import os
 from typing import Dict
 
-import pytest
-
-from tests.conftest import VllmRunner
+from tests.e2e.conftest import VllmRunner
 
 os.environ["PYTORCH_NPU_ALLOC_CONF"] = "max_split_size_mb:256"
 
@@ -78,8 +76,6 @@ def _deepseek_torchair_test_fixture(
         print(f"Generated text: {vllm_output[i][1]!r}")
 
 
-@pytest.mark.skipif(os.getenv("VLLM_USE_V1") == "0",
-                    reason="torchair graph is not supported on v0")
 def test_e2e_deepseekv3_with_torchair():
     additional_config = {
         "torchair_graph_config": {
@@ -89,8 +85,6 @@ def test_e2e_deepseekv3_with_torchair():
     _deepseek_torchair_test_fixture(additional_config)
 
 
-@pytest.mark.skipif(os.getenv("VLLM_USE_V1") == "0",
-                    reason="torchair graph is not supported on v0")
 def test_e2e_deepseekv3_with_torchair_ms_mla():
     additional_config = {
         "torchair_graph_config": {
@@ -150,8 +144,6 @@ def _pangu_torchair_test_fixture(
         print(f"Generated text: {vllm_output[i][1]!r}")
 
 
-@pytest.mark.skipif(os.getenv("VLLM_USE_V1") == "0",
-                    reason="torchair graph is not supported on v0")
 def test_e2e_pangu_with_torchair():
     additional_config = {
         "torchair_graph_config": {