REL-2307: P1-monitor does not handle classical proposals

This is a hotfix to let P1-monitor process classical and queue proposals, as it is needed for the new korea backend.

A hotfix would require a version change, however there is no p1-monitor-master version. Instead we rely on the pit version but that may be wrong. Do you think we should have a separate version and change the build?

As a hotfix I need to merge to both develop and p1-monitor-master. The latter cannot be done on GH and will be done manually after the merge to develop
Your changes look fine to me. Looking at the surrounding code though I think I'd try to refactor this `match` to return something like `Option[Response]` (?) in order to factor out that `map(_.receipt.id).mkString(" ")` bit but maybe the response types are all different or something.  Also, that's probably not a good idea in a hot fix!  :+1: