Handle crashes during a test run

[iampatbrown]

💬 Context

If a test run crashes, uploads will be interupted and information related to the crash is not captured/reported. It would be good to handle crashes and report them as test failures if possible.

📝 Notes

• fatal errors, precondition failures, force unwrapping nil are some examples that aren't captured at the moment
• This could get a little tricky for cross platform support
• xcodebuild test and swift test are likely going to recover from a crash differently. I have a feeling xcodebuild test restarts, adds the crash to the xcresults file and continues running the tests, while swift test might just stop running the tests.
• Unsure how swift test --parallel approaches this as well.
• Crashing while the debugger is attached will also need to be considered ie. when running tests in Xcode.