[compiler] Remove sleep in manual release script

I originally added this prior to the compiler being OSS'd as a "just in
case" feature to panic cancel if something went wrong. Now that the
compiler is already launched this is unnecessary.

ghstack-source-id: dd17dc8a331657ce23c0cbc012ba967cfc3b9542
Pull Request resolved: https://github.com/facebook/react/pull/30613