ray/serve/generated file is missing after running setup-dev.py

[mimiliaogo]

What happened + What you expected to happen

When running python setup-dev.py, it creates softlink for each python package. However, since the generated folder is not part of the repository, creating the symbolic link for the serve package inadvertently overwrites the folder and the generated folder can't be found anymore.

Versions / Dependencies

Lastest

Reproduction script

pip install -U "ray[serve] @ https://s3-us-west-2.amazonaws.com/ray-wheels/latest/ray-3.0.0.dev0-cp39-cp39-macosx_11_0_arm64.whl"
python python/ray/setup-dev.py

Issue Severity

Medium: It is a significant difficulty but I can work around it.