When disableCancelling or disableRescheduling is enabled on an event type,
the confirmation email still showed non-functional cancel/reschedule links.
The ManageLink email component already had correct conditional logic to
hide these links, but two flows constructed the CalendarEvent manually
without including the flags: the booking confirmation handler and the
payment booking flow. This caused the flags to be undefined, which
ManageLink interpreted as enabled.
Added disableCancelling and disableRescheduling to the Prisma select and
CalendarEvent object in both confirm.handler.ts and getBooking.ts.
Closes#22906
