Fix stack trace and runtime error reporting.

[cpojer]

The reporting code is a huge mess. This simplifies a bunch of things and makes everything go through the same code path and makes noStackTrace work again which hasn't worked properly for maybe half a year.

Fixes included:

• When a single test is run and it throws a runtime error, we now show the "1 test suite failed" message.
• Runtime errors, string errors and error objects thrown in tests now all render the same way and go through a single code path.
• Stack trace printing can be disabled with --noStackTrace

yay, regex

Fixes #985.

@bypass-lint

[cpojer]

@facebook-github-bot import

[ghost]

Thanks for importing. If you are an FB employee go to Phabricator to review.

[cpojer]

@facebook-github-bot import

[ghost]

Thanks for importing. If you are an FB employee go to Phabricator to review.

[github-actions]

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