test: move benchmark tests out of main test suite

Move benchmark tests (which are slow) out of the main test suite. We can
hopefully add them to node-daily-master so that they are still run daily
on CI.

PR-URL: https://github.com/nodejs/node/pull/24265


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>