Currently, it is possible to assign the same "Cash" payment method to multiple PoS.
At the moment, when creating a new PoS, Odoo tends to assign it by default. Although this is highly not recommended as it can only lead to incorrect cash control (two PoS devices rarely share the same till and therefore needs their own cash payment method).
This commit makes sure payment methods of type Cash aren't set by default when creating new PoS.
it also blocks the user from setting the same Cash payment method to multiple PoS configs.
closesodoo/odoo#92664
Task-id: 2857417
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>