[Serve] logging_config cannot be passed as a dict to serve.run in local testing mode

[paul-twelvelabs]

What happened + What you expected to happen

This works

ray.serve.run(Deployment.bind(), logging_config={"log_level": "WARNING"})

but this,

ray.serve.run(Deployment.bind(), logging_config={"log_level": "WARNING"}, _local_testing_mode=True)

fails with

  File ".venv/lib/python3.12/site-packages/ray/serve/api.py", line 462, in _run
    configure_component_logger(
  File ".venv/lib/python3.12/site-packages/ray/serve/_private/logging_utils.py", line 290, in configure_component_logger
    logger.setLevel(logging_config.log_level)
                    ^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'dict' object has no attribute 'log_level'

If it's a dict, I think the logging_config needs to converted to a LoggingConfig here.

This is low severity with the following simple workaround

ray.serve.run(Deployment.bind(), logging_config=LoggingConfig(log_level="WARNING"), _local_testing_mode=True)

Versions / Dependencies

ray==2.40.0
python==3.12

Reproduction script

see above.

Issue Severity

Low: It annoys or frustrates me.