child_process: simplify argument handling

This commit simplifies the calling of normalizeSpawnArguments()
and normalizeExecArguments(). Specifically, this commit replaces
apply() and the use of arguments with a normal function call.

PR-URL: https://github.com/nodejs/node/pull/25194


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>