OCTRL-678 Pass the error message to BKP in case of GO_ERROR

[knopers8]

An error message is now propagated to kafka events just before scheduling a GO_ERROR transition.

[knopers8]

@graduta FYI. Let me know if you would like a core binary to give it a spin.

[justonedev1]

Is there a reason why you are not sending the error message directly from GO_ERROR transition from the environment?

[knopers8]

Is there a reason why you are not sending the error message directly from GO_ERROR transition from the environment?

Yes, for two reasons:

• it's not known anymore, but we could work it around by adding it as a string argument in NewGoErrorTransition and adding the call to GoErrorTransition.do(). But...
• If a critical hook for before_GO_ERROR fails, we will never reach GoErrorTransition.do().