Exam: Notifications when start time and due time gets changed by the same amount

[HawKhiem]

Is your feature request related to a problem?

I was testing this PR #10026 when I noticed that when changing the start time and due time of an exam by the same amount (so that the working time stays the same) while a student is taking the exam. The student is not notified about the change. This might be troublesome if in an exam the due time and the start time both need to be changed due to some issues. Of course the case where the start time and the due time both get changed by the same amount is rare but I think it is still a good idea to implement notifications for this edge case nonetheless.

test1.mp4

Describe the solution you'd like

Pop up notifications whenever start or due time is changed. I think currently notifications would only show up when the working time is affected, which is sufficient for most cases since we would normally only change the due time if some issues ever occur.

Describe alternatives you've considered

No response

Additional context

No response