[POS Orders] Hook `createdVia` from networking to business layer#15847

iamgabrielma merged 3 commits intotrunkwoocommerce/woocommerce-ios:trunkfrom

task/WOOMOB-701-update-networking-model-to-use-createdvia-propwoocommerce/woocommerce-ios:task/WOOMOB-701-update-networking-model-to-use-createdvia-propCopy head branch name to clipboard