test: investigate windows failures

[jasnell]

Consistently getting failures in test-child-process-fork-closed-channel-segfault and test-child-process-fork-net on Windows. Started recently.

not ok 51 parallel/test-child-process-fork-closed-channel-segfault
  ---
  duration_ms: 0.294
  severity: fail
  exitcode: 1
  stack: |-
    c:\workspace\node-test-binary-windows\test\parallel\test-child-process-fork-closed-channel-segfault.js:70
                throw err;
                ^
    
    Error: write EMFILE
        at ChildProcess.target._send (internal/child_process.js:741:20)
        at ChildProcess.target.send (internal/child_process.js:625:19)
        at Worker.send (internal/cluster/worker.js:40:28)
        at Socket.<anonymous> (c:\workspace\node-test-binary-windows\test\parallel\test-child-process-fork-closed-channel-segfault.js:36:16)
        at Object.onceWrapper (events.js:273:13)
        at Socket.emit (events.js:182:13)
        at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1147:10)
  ...
not ok 52 parallel/test-child-process-fork-net
  ---
  duration_ms: 0.341
  severity: fail
  exitcode: 1
  stack: |-
    PARENT: server listening
    CHILD: server listening
    CLIENT: connected
    PARENT: got connection
    CLIENT: connected
    CHILD: got connection
    CLIENT: closed
    CHILD: got connection
    CHILD: got connection
    CLIENT: closed
    CLIENT: connected
    CLIENT: connected
    CLIENT: closed
    CLIENT: closed
    PARENT: server closed
    CHILD: got socket
    CLIENT: got data
    CLIENT: closed
    testSocket, listening
    events.js:167
          throw er; // Unhandled 'error' event
          ^
    
    Error: write EPIPE
        at ChildProcess.target._send (internal/child_process.js:741:20)
        at ChildProcess.target.send (internal/child_process.js:625:19)
        at SocketListSend._request (internal/socket_list.js:20:16)
        at SocketListSend.close (internal/socket_list.js:40:10)
        at Server.close (net.js:1624:24)
        at Socket.<anonymous> (c:\workspace\node-test-binary-windows\test\parallel\test-child-process-fork-net.js:179:16)
        at Socket.emit (events.js:182:13)
        at TCP._handle.close [as _onclose] (net.js:596:12)
    Emitted 'error' event at:
        at process.nextTick (internal/child_process.js:745:39)
        at process._tickCallback (internal/process/next_tick.js:61:11)

[Trott]

Partial duplicate of #20836

[Trott]

Consistently getting failures

These failures are not happening consistently. They are happening frequently, though.

(Consistently = always; frequently = often. The intended meaning is probably clear to someone reading it right now with access to the CI, but potentially wouldn't be to someone looking at this issue in 3 months.)

[Trott]

I see that this isn't a partial duplicate of #20836 but is in fact a complete duplicate as both tests are mentioned in the original post there. Closing this one.