[Misc] Add SPDX-FileCopyrightText (#19100)

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

tests/v1/sample/test_topk_topp_sampler.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import pytest
 import torch
 from flashinfer.sampling import top_k_renorm_probs, top_p_renorm_probs

tests/v1/sample/utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from enum import Enum
 from typing import Optional

tests/v1/shutdown/test_delete.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test that we handle a startup Error and shutdown."""
 
 import pytest

tests/v1/shutdown/test_forward_error.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test that we handle an Error in model forward and shutdown."""
 
 import asyncio

tests/v1/shutdown/test_processor_error.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test error handling in Processor. Should not impact other reqs."""
 
 import asyncio

tests/v1/shutdown/test_startup_error.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test that we handle a startup Error and shutdown."""
 
 import pytest

tests/v1/shutdown/utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Shutdown test utils"""
 
 SHUTDOWN_TEST_TIMEOUT_SEC = 120

tests/v1/spec_decode/test_eagle.py

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

tests/v1/spec_decode/test_max_len.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test whether spec decoding handles the max model length properly."""
 
 import pytest

tests/v1/spec_decode/test_ngram.py

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

tests/v1/structured_output/test_utils.py

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

tests/v1/test_async_llm_dp.py

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

tests/v1/test_metrics_reader.py

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

tests/v1/test_oracle.py

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

tests/v1/test_serial_utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from collections import UserDict
 from dataclasses import dataclass
 from typing import Optional

tests/v1/test_utils.py

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

tests/v1/tpu/test_basic.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """A basic correctness check for TPUs
 
 Run `pytest tests/v1/tpu/test_basic.py`.

tests/v1/tpu/test_mha_attn.py

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

tests/v1/tpu/test_multimodal.py

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

tests/v1/tpu/test_pallas.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from unittest.mock import ANY, patch
 
 import torch