test: mark test-cli-syntax as flaky/unreliable
Collaborators,
I hate to do this with a bug that occurs so frequently in CI and is likely to be significant in some environments, but if a fix isn't imminent, this is the right thing to do, I suppose...
Refs: https://github.com/nodejs/node/issues/24403
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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