Fix an issue where partialAddresses flag was set to false, which would invalidat the already set (through a updateCheckout: call) shippingRate on a checkout during completeCheckout:

Refactor partial address handling to prevent a partial address to be applied on a completed checkout

fixes for integration tests

fix partialAddress unit test

Allow for partial address flag to be set to false on update

Prevent partial address from being sent post Apple Pay authentication