Investigate flaky parallel/test-process-wrap on macos

[bnoordhuis]

Seems to time out frequently as of late.

12:08:43 not ok 2473 parallel/test-process-wrap
12:08:43   ---
12:08:43   duration_ms: 120.72
12:08:43   severity: fail
12:08:43   exitcode: -15
12:08:43   stack: |-
12:08:43     timeout
12:08:43     (node:25456) internal/test/binding: These APIs are for internal testing only. Do not use them.
12:08:43     (Use `node --trace-warnings ...` to show where the warning was created)

Example run: https://ci.nodejs.org/job/node-test-commit-osx/49092/nodes=osx1015/console

It's a really old test (f01b241 from 2011) that's testing internal implementation details that don't need testing so maybe it should just go.