Add dead letter queue to handle failed messages #687
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Added a DLQ that triggers after 4 failed attempts. Then a lambda function triggers from it, which checks if the user was still registered.
If the user is not registered something went really wrong and it sends a notification to sns (which triggers our slack lambda function? Not sure yet).
If the user is registered that means only something in the handling of the message went wrong, which we should investigate, but will not stop registrations from proceeding.
TODO: