repl: deprecate REPLServer.rli

This is only a reference to the instance and should not be used.

PR-URL: https://github.com/nodejs/node/pull/26260


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>