fix(sw-1867): Don't allow same name or membno between rooms
* fix(sw-1867): Don't allow same name or membno between rooms
We don't want to allow two different rooms to have the same firstname
and lastname combination or the same membership number.
* Fine tune validation triggers
* Add comments explaining manual validation triggering
* Change to react-hook-form built-in deps instead
Approved-by: Simon.Emanuelsson
