test: refactor test-child-process-pass-fd
Add a comment explaining the test (especailly why it forks 80 processes. Use destructuring and an arrow function callback.
Ping @santigimeno (who wrote the test)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
test child_process