Add a "you're already checked in" state

[Cellivar]

Reprints are out of scope for this system, however, the ability to detect that a badge is about to be reprinted is important.

We want to allow badges to be printed only at one point in time: on first checkin. We can hit the print button as many times as we want from that screen, but the moment we navigate away we want printing to be prevented by a message indicating the attendee needs to go to the help line instead for a reprint.

• Add a state before printing that shows up if the Checked In Date is anything other than "not checked in".
• Add a call on printing that marks the user as checked in. The call should only happen once per print page load, after the initial print follow up prints don't attempt to check in again.