Spec and prototype omitting the traceback for known user errors
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Issue body
### What needs to get done
Design a mechanism to avoid outputting the craft-tool traceback (to the log file and terminal) in case the error happens for a cause that we know for sure isn't a bug (e.g. a plugin build failure).
### Why it needs to get done
The current log is super noisy and makes it hard to find the "true" cause of a failure:

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