[Misc] Add SPDX-FileCopyrightText (#19100)

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

tests/distributed/test_comm_ops.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Test the communication operators.
 
 Run `pytest tests/distributed/test_comm_ops.py`.

tests/distributed/test_custom_all_reduce.py

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

tests/distributed/test_distributed_oot.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from ..entrypoints.openai.test_oot_registration import (
     run_and_test_dummy_opt_api_server)

tests/distributed/test_events.py

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

tests/distributed/test_expert_parallel.py

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

tests/distributed/test_multi_node_assignment.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Make sure ray assigns GPU workers to the correct node.
 
 Run:

tests/distributed/test_pipeline_parallel.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 WARNING: This test runs in both single-node (4 GPUs) and multi-node
  (2 node with 2 GPUs each) modes. If the test only uses 2 GPUs, it is

tests/distributed/test_pipeline_partition.py

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

tests/distributed/test_pp_cudagraph.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from __future__ import annotations
 
 from typing import TYPE_CHECKING

tests/distributed/test_pynccl.py

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

tests/distributed/test_same_node.py

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

tests/distributed/test_sequence_parallel.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 WARNING: This test runs in both single-node (4 GPUs) and multi-node
  (2 node with 2 GPUs each) modes. If the test only uses 2 GPUs, it is

tests/distributed/test_shm_broadcast.py

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

tests/distributed/test_torchrun_example.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 # unit test for `examples/offline_inference/torchrun_example.py`
 import os

tests/distributed/test_utils.py

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

tests/encoder_decoder/test_e2e_correctness.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """E2E tests to verify the correctness of the encoder-decoder framework
 
 Run `pytest tests/encoder_decoder/test_e2e_correctness.py`.

tests/engine/conftest.py

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

tests/engine/test_arg_utils.py

 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import json
 from argparse import ArgumentError, ArgumentTypeError

tests/engine/test_computed_prefix_blocks.py

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

tests/engine/test_executor.py

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