[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/singlecard/test_ilama_lora.py

@@ -3,7 +3,7 @@ import vllm
 from modelscope import snapshot_download  # type: ignore
 from vllm.lora.request import LoRARequest
 
-from tests.conftest import VllmRunner
+from tests.e2e.conftest import VllmRunner
 
 MODEL_PATH = "vllm-ascend/ilama-3.2-1B"