Add ERRORED status for pipeline

Execution can fail and there should be a way to communicate that to the TA3. Another solution is to use the Response field to indicate errors, however right now it's not clear that an error Response means that the specific pipeline failed but the overall CreatePipeline process is still going on fine.

A TA3 not handling this message would just never see this pipeline getting to the COMPLETED state before the response stream is closed.