Update frontend references of vat code to tax ID instead
Problem
Tax ID is the preferred naming over VAT Code since not every country uses value-added tax terminology. On the frontend, we converted to Tax ID
naming convention, but the backend still refers to "vat_code".
Proposal
To reduce confusion, rename any "vat_code" or "vat_field_visible" references on the backend (and any potential lingering frontend usages) so that the naming is consistent.
Edited by Laura Callahan