Generate test failure output on abnormal termination

[dfields-msft]

Fixes #1010 by calling Catch2's reportFatal() in the std::terminate handler so that failure logging is generated before the process exits.

[kennykerr]

Thanks David! Why don't you add the noexcept back to the guid constructor that I removed here:

https://github.com/microsoft/cppwinrt/pull/1009/files

That will verify whether the CI build fails visibly or silently. Once that has been confirmed, just remove the noexcept again and it should be green again.

[kennykerr]

The log captures the failure but it doesn't fail the build itself.

[dfields-msft]

It's worse than that - even normal test failures don't cause the pipeline to fail (see my latest commit in this PR and the corresponding run). I've sent email to the team to discuss.

[dfields-msft]

Added some changes to reroute output to stderr when the test executable does not exit cleanly, and validated that this fails the pipeline with the noexcept in place as expected:

[kennykerr]

Thanks!

[dfields-msft]

Logged #1012 on an unrelated test failure that passed on rerun (also passed on both x86 runs); this may have been masked for some time due to the lack of failure reporting in the build pipeline until now.