[Misc] Add SPDX-FileCopyrightText (#19100)

Signed-off-by: simon-mo <simon.mo@hey.com>

tests/engine/test_multi_step_output_processor.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import random
 from unittest.mock import MagicMock

tests/engine/test_multiproc_workers.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import asyncio
 from concurrent.futures import ThreadPoolExecutor

tests/engine/test_options.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from contextlib import nullcontext
 
 import pytest

tests/engine/test_short_mm_context.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
 

tests/entrypoints/conftest.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
 

tests/entrypoints/llm/test_accuracy.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file test accuracy of the vLLM server via LMEval.
 It uses local-completions, which interacts with vLLM

tests/entrypoints/llm/test_chat.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import weakref
 
 import pytest

tests/entrypoints/llm/test_collective_rpc.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
 

tests/entrypoints/llm/test_encode.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import weakref
 

tests/entrypoints/llm/test_generate.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import weakref
 

tests/entrypoints/llm/test_generate_multiple_loras.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import weakref
 

tests/entrypoints/llm/test_gpu_utilization.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from vllm import LLM, SamplingParams
 

tests/entrypoints/llm/test_guided_generate.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import json
 import weakref

tests/entrypoints/llm/test_lazy_outlines.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import sys
 from contextlib import nullcontext

tests/entrypoints/llm/test_prompt_validation.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
 

tests/entrypoints/offline_mode/test_offline_mode.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for HF_HUB_OFFLINE mode"""
 import importlib
 import sys

tests/entrypoints/openai/correctness/test_lmeval.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file test accuracy of the vLLM server via LMEval.
 It uses local-completions, which interacts with vLLM

tests/entrypoints/openai/correctness/test_mteb.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import os
 
 import pytest

tests/entrypoints/openai/correctness/test_transcription_api_correctness.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 Evaluate Transcription API correctness by computing Word Error Rate (WER)
 on a given ASR dataset. When provided, it will also compare the WER against

tests/entrypoints/openai/test_async_tokenization.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import asyncio
 import contextlib