✨ Sprint | Add support for multiple-Sprints when Start of the next Sprint intersects with End of the previous Sprint

[jernejk]

When we start a new Sprint, daily scrum generation isn't quite right as it can't see what happened yesterday. This is because it only supports the latest, and we lose visibility for the previous day when a new Sprint starts.

Some teams start the next Sprint on the day the previous one ended, technically having two active Sprints on the same day.

NOTE: Complete #105 before tackling this one.

Acceptance criteria

1. When a new Sprint starts on the same day as the last Sprint end, we should still be able to generate the "Yesterday" section correctly