Retry without exception throwing

[arfl]

[Edit 02.01.2023]:

https://studitemps.atlassian.net/browse/FOT-1340

Die API der Library ist an dieser Stelle doof. Man muss dran denken, etwaige Fehler beim Handling von Events zu throwen, ansonsten greift der Retry-Mechanismus nicht.

[kaikuchn]

We first want to migrate our EventConsumers away from throwing retries by themselves. We achieve this by having the Shared.EventConsumer implementation handle throwing on error results. In a follow-up step we can then rewrite the retry mechanism to trigger a retry on error tuple results without any throwing and only need to change the Shared.EventConsumer to no longer throw anything.