test: remove common.busyLoop()

This commit replaces common.busyLoop() with sleep().

PR-URL: https://github.com/nodejs/node/pull/30787


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>