benchmark: refactor util benchmarks

This significantly reduces the benchmark runtime. It removes to many
variations that do not provide any benefit and reduces the iterations.

PR-URL: https://github.com/nodejs/node/pull/22503


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>