Starting a Trinity Ray job, spawns many more secondary Ray jobs

These seem to correspond to vllm engines. Is it expected that these vllm instances get spawned as Jobs, and not as actors within the main job?

Thanks!

```
Process 1066282: /mnt/local/venv_trinity/bin/python3 -c from multiprocessing.spawn import spawn_main; spawn_main(tracker_fd=88, pipe_handle=90) --multiprocessing-fork
Python v3.12.11 (/usr/bin/python3.12)

Thread 1066282 (active+gil): "MainThread"
fn (torch/_dynamo/utils.py:4353)
_fn (torch/_dynamo/eval_frame.py:838)
call_size (torch/_dynamo/utils.py:4355)
forward (vllm/model_executor/models/qwen2.py:337)
__call__ (vllm/compilation/decorators.py:246)
forward (vllm/model_executor/models/qwen3.py:303)
_call_impl (torch/nn/modules/module.py:1762)
_wrapped_call_impl (torch/nn/modules/module.py:1751)
execute_model (vllm/v1/worker/gpu_model_runner.py:1374)
decorate_context (torch/utils/_contextlib.py:116)
execute_model (vllm/v1/worker/gpu_worker.py:308)
decorate_context (torch/utils/_contextlib.py:116)
run_method (vllm/utils/__init__.py:2736)
collective_rpc (vllm/executor/uniproc_executor.py:57)
execute_model (vllm/v1/executor/abstract.py:87)
execute_model (vllm/v1/engine/core.py:212)
step (vllm/v1/engine/core.py:235)
_process_engine_step (vllm/v1/engine/core.py:631)
run_busy_loop (vllm/v1/engine/core.py:606)
run_engine_core (vllm/v1/engine/core.py:579)
run (multiprocessing/process.py:108)
_bootstrap (multiprocessing/process.py:314)
_main (multiprocessing/spawn.py:135)
spawn_main (multiprocessing/spawn.py:122)
(:1)
Thread 1066609 (idle): "Thread-1 (_report_usage_worker)"
_report_continuous_usage (vllm/usage/usage_lib.py:233)
_report_usage_worker (vllm/usage/usage_lib.py:168)
run (threading.py:1012)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1066700 (idle): "Thread-2"
wait (threading.py:359)
wait (threading.py:655)
run (tqdm/_monitor.py:60)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1066760 (idle): "Thread-3"
wait (threading.py:359)
wait (threading.py:655)
run (tqdm/_monitor.py:60)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1067483 (idle): "Thread-4 (process_input_sockets)"
poll (zmq/sugar/poll.py:106)
process_input_sockets (vllm/v1/engine/core.py:734)
run (threading.py:1012)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1067487 (idle): "Thread-5 (process_output_sockets)"
wait (threading.py:355)
get (queue.py:171)
process_output_sockets (vllm/v1/engine/core.py:779)
run (threading.py:1012)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1074225 (idle): "ray_listen_error_messages"
listen_error_messages (ray/_private/worker.py:2338)
run (threading.py:1012)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
Thread 1074255 (idle): "ray_print_logs"
print_logs (ray/_private/worker.py:1006)
run (threading.py:1012)
_bootstrap_inner (threading.py:1075)
_bootstrap (threading.py:1032)
```