Error sending Kafka events for batch operations when many times the same entity id

[bobeal]

When a batch operation contains many times the same entity id, sending of the associated event in Kafka fails as the service is unable to correctly find the original payload to send since it searches it using the entity id but gets the wrong one because there are many times the same entity id.

It thus implies to move this event sending at the place where the operation for each entity in the batch is done.