test(node_compat): enable parallel/test-child-process-send-utf8.js (#34778)
`parallel/test-child-process-send-utf8.js` forks a child process and
round-trips a large UTF-8 string (`'ßßßß'.repeat(1e5 - 1)`) over the IPC
channel, asserting the received message equals what was sent. The test
already passes against the current implementation, so this enables it in
the node compat config.