feat(SW-3514): Add variant of join friends card with membership id input
* Move membershipId input in enter details to join card
Add booking flow feature flag to move membershipId into join card and hide login button.
Currently only applies to first room.
* Add sas join card to multiroom
Approved-by: Hrishikesh Vaipurkar
fix(BOOK-121): clear join only if membership number is valid and calculate correct member price
* fix(BOOK-121): clear join only if membership number is valid and calculate correct member price
Approved-by: Erik Tiekstra
Approved-by: Matilda Landström