As an event organizer, I want to be able to specify if an event is a test event (such as an event in my sandbox) or a real event, so that users who are looking for real events to join will not mistakenly register for my test events.
As a user of the Collaboration List, I only want to see real events displayed, so I can see which events that I can join.
**Acceptance Criteria:**
* Given that an organizer is creating or editing Event Registration
** They should see a new field at the bottom of the form, below "Grant ID"
** The field title should be: "Is this a live or test event?"
*** And there should be a dropdown with 2 options:
**** Live event
**** Test event
*** And the default should be set to "Live event"
** If the user picks "Live event"
*** Behavior remains the same for the event page (no changes)
** If the user picks "Test event"
*** The event should not display in the Collaboration List
*** The event should display in all other places
* This work should be behind a feature flag, and it should only be released after we finish the survey
**Example of what we see now and want to change:**
{F50589926}