test: refactor child-process-fork-net
Split test-child-process-fork-net into test-child-process-fork-net-server and test-child-process-fork-net-socket. Rename test-child-process-fork-net2.js to test-child-process-fork-net.js.
Refs: https://github.com/nodejs/node/pull/21012
One of the files involved here is actively being worked on in an effort to make it not flaky. If the fix ends up being to the test (rather than a bug in Node.js itself), it will have a merge conflict with this. I'll rebase or close if that happens. (Just don't want the people working on the test to see this and get annoyed or worried or something along those lines.)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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