[v6.x backport] test: improve flaky test-listen-fd-ebadf.js #18362
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Find an invalid file descriptor rather than assuming 42 will be invalid.
PR-URL: #17797
Fixes: #17762
Reviewed-By: Gibson Fahnestock gibfahn@gmail.com
Reviewed-By: James M Snell jasnell@gmail.com
Reviewed-By: Khaidi Chu i@2333.moe
Reviewed-By: Luigi Pinca luigipinca@gmail.com
Reviewed-By: Ruben Bridgewater ruben@bridgewater.de
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passesAffected core subsystem(s)
test