✨ UX - Update Tina event form to fetch presenter information from the presenter list

@wicksipedia

Description

During the SharePoint Tina migration the existing events were ported wholesale with some minor improvements, with the goal being to prevent data loss. Some of the ported fields are redundant because we're already storing this data using Tina, i.e. presenter information (Presenter Name, presenter profile).

- [ ] Port any presenters from the old events to Tina (if they aren't already)
- [ ] update all of the old events to store the main presenter in the presenter list
- [ ] remove the presenter name and profile url fields from Tina
- [ ] Update the User Group, page to pull data out about the presenter from the Presenter List field during a livestream
- [ ] Update the Event list page to pull information about the presenter from the Presenter list field

Screenshots

Start by locating the Tina event form, presenter list, User Group page, and Event list page named in the task list. Review how existing events store presenter data and how the old presenter fields are represented. Done means presenters are migrated, old events use the presenter list, redundant fields are removed, and both pages display presenter information from that list.