## What does this PR do?
- Fix that the last day in Oktober was always shown as unavailable
This happened when availability was in Europe/London timezone
- Fix that the last day of November was always shown as unavailable
This happened also for other timezones
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
## How should this be tested?
I recommend testing it in staging instead of local, as I experienced some different behaviors on local
- Reproduce the 2 bugs as described before my fix
- If you were able to reproduce it, see if it is fixed with my fixes in this PR (last day of octber and November should be shown as available)
- Check if availability starts and ends at the correct time on days were DST happens
* chore: Simplified date overrides
* Fixed a test that had a date override that wasn't at midnight utc
* Wrote test that showed a fixed Europe/Brussels
* Lint fix
## What does this PR do?
<!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. -->
- Passes the proper seats data in the new booker component between states and to the backend
Fixes#9779Fixes#9749Fixes#7967Fixes#9942
<!-- Please provide a loom video for visual changes to speed up reviews
Loom Video: https://www.loom.com/
-->
## Type of change
<!-- Please delete bullets that are not relevant. -->
- Bug fix (non-breaking change which fixes an issue)
## How should this be tested?
<!-- Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration -->
**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
<!-- Please remove all the irrelevant bullets to your PR -->
