Improve CLI error messages

[koesie10]

This improves the CLI error messages by trying to parse the stderr if it matches a known exit code. This doesn't handle all cases, but it handles the most common cases. In case another error is returned, it will now simply print the stderr itself, rather than starting with ${description} failed with ${args}:. This can still be found in the extension logs, and is already printed when starting execution of the command in the extension logs as well.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[robertbrignull]

If I'm not mistaken, this message will come out as:

SomeCommand failed with args:
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
stderr stderr stderr stderr stderr stderr stderr stderr
 arg1 arg2 arg3

Should the args come before the stderr?

[koesie10]

Yes, you're right. I've updated this to be correct.

[robertbrignull]

LGTM