## What does this PR do?
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- Passes the proper seats data in the new booker component between states and to the backend
Fixes#9779Fixes#9749Fixes#7967Fixes#9942
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## Type of change
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- Bug fix (non-breaking change which fixes an issue)
## How should this be tested?
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**As the organizer**
- Create a seated event type
- Book at least 2 seats
- Reschedule the booking
- All attendees should be moved to the new booking
- Cancel the booking
- The event should be cancelled for all attendees
**As an attendee**
- [x] Book a seated event
- [x] Reschedule that booking to an empty slot
- [x] The attendee should be moved to that new slot
- [x] Reschedule onto a booking with occupied seats
- [x] The attendees should be merged
- [x] On that slot reschedule all attendees to a new slot
- [x] The former booking should be deleted
- [x] As the attendee cancel the booking
- [x] Only that attendee should be removed
## Mandatory Tasks
- [x] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.
## Checklist
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Joe Au-Yeung