test: split test-cpu-prof.js

Split test-cpu-prof.js into multiple files for different
test cases so it's easier to find the problematic one if
it flakes.

Also move the split tests into parallel.

PR-URL: https://github.com/nodejs/node/pull/28170
Refs: https://github.com/nodejs/node/issues/27611


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>