4810 display participants in the right drawer of the calendar event (#4896)

Closes #4810

- Introduces a new component `ExpandableList` which uses intersection
observers to display the maximum number of elements possible

packages/twenty-front/src/modules/activities/calendar/right-drawer/components/RightDrawerCalendarEvent.tsx

@@ -14,6 +14,7 @@ export const RightDrawerCalendarEvent = () => {
     objectNameSingular: CoreObjectNameSingular.CalendarEvent,
     objectRecordId: viewableCalendarEventId ?? '',
     onCompleted: (record) => setRecords([record]),
+    depth: 2,
   });
 
   if (!calendarEvent) return null;