Summary of the new feature / enhancement

make __PSLockdownpolicy only work in debug build.

This is only for testing and should not be used in production.

Proposed technical implementation details (optional)

make __PSLockdownpolicy only work in debug build.

This is only for testing and should not be used in production.

Also emit a warning that this is __PSLockdownpolicy is a test hook not meant for production when the feature is enabled.