[scheduler][styled] Allow editing events directly inside the `MoreEventsPopover`

[noraleonte]

It is very common for events inside a MoreEventsPopover to be editable, which, in our case would mean nesting the popovers.

Displaying two popovers at the same time requires a bit more exploration.
In the current implementation, if we add an EventPopoverTrigger inside the MoreEventsPopover (first popover opened), when the trigger is clicked, the MoreEventsPopover closes, and the EventPopover loses its anchor.