[Forced Reservations] Show existing session when moving sessions for students #80
Description
Now that we're making reservations for students thanks to the forced reservation feature, I noticed that I have to remember/write down what the student's existing reservation is.
Often, I need to move reservations to account for a new accommodation that was added (it's not fair to ask students to cancel and rebook) and I need to book them into the same session.
Another use case of this is to move them from one room to another (because the second room is sparsely populated and we need to consolidate).
In both of the above cases, having the existing reservation show up in the modal would be useful.
