This commit stops the test runner CLI from parsing child
process stderr as TAP. Per the TAP spec, TAP can only come from
stdout. To avoid losing stderr data, those logs are injected
into the parser as unknown tokens so that they are output as
comments.
PR-URL: https://github.com/nodejs/node/pull/45618
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>