L3 - Default Description
Context:
Current implementation always tries to get increased size pages, this doesn't scale with large instance counts. Further userTasks are completed sequentially by on thread which takes a lot of time on high instance counts as well, we need to batch this.
AT:
- the UserTaskCompleter pages through available userTasks based on their creationDate
- one page of userTasks is handled in a parallel manner instead of 1 by 1