[Queue-2.0] Add possibility to edit capacity per time slot
# Summary <!--Describe the feature you are requesting here. Describe clearly what you want to have happen (differently). If possible, add screenshots to more clearly convey your request.--> We want to be able to conveniently set the capacity for a range of timeslots or one specific time slot. # Reasoning <!--Describe which problem your request would solve and describe your reasoning behind wanting this feature.--> During a lab, some teachers need to reconfigure the number of slots available during the lab to do some manual load balancing.
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