Now that all other methods that use ScheduledTask::findByTypeAndStatus()
were moved to ScheduledTasksRepository, we can move
findFutureScheduledByType() as well and delete
ScheduledTask::findByTypeAndStatus().
[MAILPOET-3845]
When refactoring ScheduledTask::findByTypeAndStatus() to
ScheduledTasksRepository::findByTypeAndStatus(). During the process, I
mistankenly converted `$query->whereGt('scheduled_at', $now);` to
`$queryBuilder->andWhere('st.scheduledAt >= :now');`. It should be `>`
instead of `>=`.
[MAILPOET-2996]
