CP-2245 Address triggering a failure in an interceptor (that could then be retried).

[evanweible-wf]

A 200 OK response is not always equivalent to a successful state. Interceptors need to be able to trigger a failure state even when the request itself did not fail.

As currently implemented, interceptors can throw an exception to trigger a failure, and I think this is the approach I'd like to recommend. Regardless, the documentation needs to be updated to explicitly cover this use case.

fyi: @jeroencranendonk-wf