Revert "child_process: measure buffer length in bytes" #7377
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Checklist
make -j4 test
(UNIX) orvcbuild test nosign
(Windows) passesAffected core subsystem(s)
child_process
Description of change
This needs #7375 to land first.
Refs: #7342
The commit being reverted fixed a bug but accidentally introduced a breaking change. This reverts it. The change should be re-proposed as semver-major.