test: add test-benchmark-assert

Add minimal test for `assert` benchmarks.

PR-URL: https://github.com/nodejs/node/pull/15174


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>