Admin ability to override event close date, unpublished and not accepting registration state

Admins now have the flexibility to accept new registrations even after the event's closure date, while it's unpublished, and not currently open for registrations. This enables admins to add VIPs, board members, trustees, and registrations made offline without the risk of regular users registering in the meantime. It ensures that admins can include important registrations without needing to open the event to everyone. Admins can accomplish this by using the '+' icon in the 'Guest Manager’.