Registration API Bug: switching reg type results in multiple MeetingRegistration records

[rpcross]

Describe the issue

If a registrant switches registration type onsite -> remote, or vice-versa, a new MeetingRegistration record is created, resulting in two records for the person. The question is, how do we differentiate this scenario, switching registrations, from the, albeit rare, situation where someone does actually register for both online and remote.

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