[Misc] Add SPDX-FileCopyrightText (#19100)

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

tests/kernels/quantization/test_gptq.py

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

tests/kernels/quantization/test_int8_kernel.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 # Adapted from https://github.com/sgl-project/sglang/blob/main/test/srt/test_int8_kernel.py
 import itertools

tests/kernels/quantization/test_int8_quant.py

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

tests/kernels/quantization/test_machete_mm.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for the machete kernel.
 
 Run `pytest tests/kernels/test_machete_mm.py`.

tests/kernels/quantization/test_marlin_gemm.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for the marlin kernel.
 
 Run `pytest tests/kernels/marlin/test_marlin_gemm.py`.

tests/kernels/quantization/test_nvfp4_quant.py

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

tests/kernels/quantization/test_nvfp4_scaled_mm.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import pytest
 import torch
 from nvfp4_utils import (FLOAT4_E2M1_MAX, FLOAT8_E4M3_MAX,

tests/kernels/quantization/test_rocm_skinny_gemms.py

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

tests/kernels/quantization/test_triton_scaled_mm.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for the triton_scaled_mm kernel
 
 Run `pytest tests/kernels/test_triton_scaled_mm.py`.

tests/kernels/test_cutlass_mla_decode.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import pytest
 import torch
 import torch.nn.functional as F

tests/kernels/test_fused_quant_activation.py

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

tests/kernels/test_triton_flash_attention.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Tests for the triton_flash_attention kernel
 
 Run `pytest tests/kernels/test_triton_flash_attention.py`.

tests/kernels/utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Kernel test utils"""
 
 import itertools

tests/kv_transfer/test_disagg.py

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

tests/kv_transfer/test_lookup_buffer.py

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

tests/kv_transfer/test_module.py

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

tests/kv_transfer/test_send_recv.py

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

tests/lora/conftest.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import tempfile
 from collections import OrderedDict

tests/lora/test_add_lora.py

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

tests/lora/test_baichuan.py

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