how to cleanly exit when using `accelerate launch`

sorry for the silly question, i've searched and cannot find the answer

### System Info
accelerate 0.16.0
python 3.10.6
torch 2.0.0.dev20230211+cu118 CUDA: 11.8 cuDNN: 8.7.0
os: ubuntu 22.04 running in wsl2 on windows 11

### Description

i'm launching python script using
`accelerate launch script.py`

script itself runs gradioapp web server - and when gradio queues are enabled, there is no clean way to shutdown web server. which means the only way to exit is `os._exit(0)`.

but if i do that, i always get a long traceback from `accelerate` itself - how to tell accelerate that exit is fine and don't print traceback?

note: accelerate 0.16 added `--quiet` flag, it doesn't change the behavior

### Traceback
```python
╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ /home/vlado/.local/bin/accelerate:8 in │
│ │
│ 5 from accelerate.commands.accelerate_cli import main │
│ 6 if __name__ == '__main__': │
│ 7 │ sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0]) │
│ ❱ 8 │ sys.exit(main()) │
│ 9 │
│ │
│ /home/vlado/.local/lib/python3.10/site-packages/accelerate/commands/accelerate_cli.py:45 in main │
│ │
│ 42 │ │ exit(1) │
│ 43 │ │
│ 44 │ # Run │
│ ❱ 45 │ args.func(args) │
│ 46 │
│ 47 │
│ 48 if __name__ == "__main__": │
│ │
│ /home/vlado/.local/lib/python3.10/site-packages/accelerate/commands/launch.py:1097 in │
│ launch_command │
│ │
│ 1094 │ elif defaults is not None and defaults.compute_environment == ComputeEnvironment.AMA │
│ 1095 │ │ sagemaker_launcher(defaults, args) │
│ 1096 │ else: │
│ ❱ 1097 │ │ simple_launcher(args) │
│ 1098 │
│ 1099 │
│ 1100 def main(): │
│ │
│ /home/vlado/.local/lib/python3.10/site-packages/accelerate/commands/launch.py:549 in │
│ simple_launcher │
│ │
│ 546 │ current_env["OMP_NUM_THREADS"] = str(args.num_cpu_threads_per_process) │
│ 547 │ │
│ 548 │ process = subprocess.Popen(cmd, env=current_env) │
│ ❱ 549 │ process.wait() │
│ 550 │ if process.returncode != 0: │
│ 551 │ │ if not args.quiet: │
│ 552 │ │ │ raise subprocess.CalledProcessError(returncode=process.returncode, cmd=cmd) │
│ │
│ /usr/lib/python3.10/subprocess.py:1207 in wait │
│ │
│ 1204 │ │ if timeout is not None: │
│ 1205 │ │ │ endtime = _time() + timeout │
│ 1206 │ │ try: │
│ ❱ 1207 │ │ │ return self._wait(timeout=timeout) │
│ 1208 │ │ except KeyboardInterrupt: │
│ 1209 │ │ │ # https://bugs.python.org/issue25942 │
│ 1210 │ │ │ # The first keyboard interrupt waits briefly for the child to │
│ │
│ /usr/lib/python3.10/subprocess.py:1941 in _wait │
│ │
│ 1938 │ │ │ │ │ with self._waitpid_lock: │
│ 1939 │ │ │ │ │ │ if self.returncode is not None: │
│ 1940 │ │ │ │ │ │ │ break # Another thread waited. │
│ ❱ 1941 │ │ │ │ │ │ (pid, sts) = self._try_wait(0) │
│ 1942 │ │ │ │ │ │ # Check the pid and loop as waitpid has been known to │
│ 1943 │ │ │ │ │ │ # return 0 even without WNOHANG in odd situations. │
│ 1944 │ │ │ │ │ │ # http://bugs.python.org/issue14396. │
│ │
│ /usr/lib/python3.10/subprocess.py:1899 in _try_wait │
│ │
│ 1896 │ │ def _try_wait(self, wait_flags): │
│ 1897 │ │ │ """All callers to this function MUST hold self._waitpid_lock.""" │
│ 1898 │ │ │ try: │
│ ❱ 1899 │ │ │ │ (pid, sts) = os.waitpid(self.pid, wait_flags) │
│ 1900 │ │ │ except ChildProcessError: │
│ 1901 │ │ │ │ # This happens if SIGCLD is set to be ignored or waiting │
│ 1902 │ │ │ │ # for child processes has otherwise been disabled for our │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
KeyboardInterrupt
```

### Information

- [ ] The official example scripts
- [X] My own modified scripts

### Tasks

- [ ] One of the scripts in the examples/ folder of Accelerate or an officially supported `no_trainer` script in the `examples` folder of the `transformers` repo (such as `run_no_trainer_glue.py`)
- [X] My own task or dataset (give details below)

### Reproduction

1. create python script that uses gradio with queue enabled
2. run python script using `accelerate.launch`
3. exit python script

### Expected behavior

```Shell
able to exit without long traceback being printed
```