PR Summary

This PR adds 39 tests to validate and track the existing command error handling behaviors.
This PR is a preparation for #15177. The new tests added here will protect regressions that could be introduced to the command error handling by #15177.

Please be noted that those tests are by no means covering every aspect of the error handling behaviors.
I tried to cover most of the subtle behaviors -- some are not well known and may even be a little confusing to some extent. This is because these subtle behaviors may not be well tested, and adding those new tests will help guard me from introducing regression without knowing when working on #15177.
For the more obvious/common behaviors, I hope they are already covered by existing tests.

PR Checklist

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