Create more sprints upfront [BB-7135]
There is an old bug in SprintCraft where sometimes it fails to retrieve a newly created sprint in the pipeline. We have partially mitigated it with this commit, but this is still sometimes happening.
We could eliminate this non-deterministic behavior by ensuring that a few future sprints exist for each cell before the pipeline is triggered.
Jira link: https://tasks.opencraft.com/browse/BB-7135
Edited by Piotr Surowiec