The default EventPublicationRegistry previously erroneously called find*In*completePublications(), i.e. returned incomplete publications when it was supposed to look up the completed ones. To be able to do the latter we need to extend EventPublicationRepository and introduce a query execution for all completed publications.
As we'd normally only chance API in major versions, but the bugfix needing to go into a bugfix release, the new method is introduced as default method rejecting the execution in case a currently existing repository implementation does not implement it. This allows us to adapt the implementations we ship to support the bugfix, but will require other implementations to ship an adapted version. This means we can ship a release that's not breaking assuming one of the official store implementations is used.
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