## 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
