Use fd 3 instead of hijacking stdout #11812
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Description
After starting with #11748 we found that we didn't like how we were hijacking stdout/stderr. So instead, let's just use file descriptor 3 that way we can still depend on stdout/stderr for their correct purposes.
ref: A simple producer/consumer example
ref: A simple Python example
ref: Is it safe to use fd 3
This is still in POC territory, still missing the fix for:
Resolves #11748
Depends on #11862
Depends on #11865
Checklist - did you ...
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directory (using the template) for the next release's release notes?