[TRIVIAL] unsuppress test output

[Yurlungur]

PR Summary

Regression test outputs suppress both stdout and stderr from the driver. When debugging this is annoying. Since things are integrated with ctest and ctestsuppresses output for tests that pass (or fail) by default anyway, it's also redundant. This PR makes output (when you ask ctest to be verbose) significantly more verbose, by including driver stdout/stderr output.

The main benefit of this is we now see, e.g., PARTHENON_THROW, PARTHENON_FAIL, PARTHENON_REQUIRE outputs and any print statements we add by hand when debugging tests. The main disadvantage is that output is way more verbose. It may also slightly change performance but not by much I think.

PR Checklist

• Code passes cpplint
• New features are documented.
• Adds a test for any bugs fixed. Adds tests for new features.
• Code is formatted
• Changes are summarized in CHANGELOG.md
• Change is breaking (API, behavior, ...)
  • Change is additionally added to CHANGELOG.md in the breaking section
  • PR is marked as breaking
  • Short summary API changes at the top of the PR (plus optionally with an automated update/fix script)
• CI has been triggered on Darwin for performance regression tests.
• Docs build
• (@lanl.gov employees) Update copyright on changed files

[BenWibking]

This would be very useful. LGTM.

[pgrete]

I love it!
Quite often I had to manually copy and paste the failed command to get to the error message.
Why didn't it occur to me earlier to suggest that kind of change...

[lroberts36]

LGTM. This is definitely a significant quality of life improvement for debugging. I also have resorted to copying the command from ctest output and running it by hand.

[Yurlungur]

@pgrete and/or someone else who knows the CI: I'm very confused. The CI is complaining that files I didn't change are unformatted, and the relevant lines aren't in this branch. Any ideas what's happening?

[pgrete]

@pgrete and/or someone else who knows the CI: I'm very confused. The CI is complaining that files I didn't change are unformatted, and the relevant lines aren't in this branch. Any ideas what's happening?

Unclear. Maybe a cosmic ray particle hit the memory of the CI machine? :D

[Yurlungur]

Fixed now anyway lol