[V0 Deprecation] Remove V0 LoRA test (#23418)

Signed-off-by: Jee Jee Li <pandaleefree@gmail.com>

tests/lora/test_add_lora.py

@@ -5,7 +5,6 @@ import time
 
 import pytest
 
-import vllm.envs as env
 from vllm.engine.arg_utils import AsyncEngineArgs
 from vllm.entrypoints.openai.api_server import (
     build_async_engine_client_from_engine_args)
@@ -98,12 +97,10 @@ async def test_add_lora(chatglm3_lora_files):
         # Run with warmup
         add_lora_tasks = [llm.add_lora(lr) for lr in warmup_run_requests]
         add_lora_results = await asyncio.gather(*add_lora_tasks)
-        if env.VLLM_USE_V1:
-            # Test that all all_lora calls are successful.
-            assert all(add_lora_results)
-        else:
-            # No way to check V0 engine results as the calls just return None.
-            pass
+
+        # Test that all all_lora calls are successful.
+        assert all(add_lora_results)
+
         time_with_add_lora = await requests_processing_time(
             llm, warmup_run_requests)