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fc8de9e087
This commit introduces a new kinda special `OnRescheduleCheck` signal that is emitted whenever we want to inform the checker to reschedule the checkable at a specific timestamp without actually changing the next check time. Previously, we called `SetNextCheck` with some random timestamp just to enforce the checker to either pick it up immediately or at a specific time. Then at some point in time, subscribing to the `OnNextCheckChanged` signal became effectively unusable for any other purpose than to inform the checker about a new next check time. Thus, it resulted in introducing a new signal that is solely responsible for informing the Icigna DB and IDO about a new next check time in places where calling `SetNextCheck` did make sense. This commit does quite the opposite: it replaces all calls to `SetNextCheck` that were only used to inform the checker about a new next check time wit `OnRescheduleCheck` calls. Only places where we actually wanted to change the next check time still call `SetNextCheck` and thus inform the checker and all other listeners about the new next check time. And as a bonus point, we now got rid of the two object locks for child and parent at the same time.