child_process: refactor to use `validateBoolean`

PR-URL: https://github.com/nodejs/node/pull/38927


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>