FIT Query: includesHttpStatusCodeInErrorContext fails

Root Issue

This failure is due to how we serialize Exceptions and send them back to the driver as a JSON string. Enums can either be serialized using their value, or their member names. There are caveats and things we could change in the SDK/Performer, but the simplest way is to have the Driver accept both error codes and error names for .NET.

An enum member BadRequest = 400 can either be serialized as "BadRequest" or "400". Different Driver tests require either (e.g. in NCBC-3731 the Driver expects "503" but receives "ServiceUnavailable". In NCBC-3697 the Driver expects to see "CollectionNotFound", but the Performer (used to) send the enum value "21").