Critical error does not report the correlation id

While using the library (thanks, btw), I was struck by the fact that despite `CorrelationId` being set, it is not reported by the `ToActionResult` extension method when converting a `CriticalError` result object. Is there a specific reason behind this? I'm using critical errors to capture unchecked exceptions, and it would be nice to let the user see their request id, especially for troubleshooting purposes.

Start by tracing the ToActionResult extension method's handling of CriticalError results and compare it with how CorrelationId is handled for other result types. Confirm the expected HTTP response behavior and add coverage for a CriticalError with a set CorrelationId; done means the converted response reports that request identifier.

Written by the indexing model from the issue text.