fix: format_row broke Document Name link validation
#35540 broke Voucher Matching, leading to an invalid link exception on submission. This is because the format_row() function overwrites the row data instead of just providing a formatter on the DataTable column, and therefore passes through the formatted (linked) column data instead of the Document Name only.
This patch moves the appropriate frappe.form.formatters.Link function to a dedicated format hook on the DataTable columns definition, both fixing the error and retaining the functionality of #35540.
7ab55b1bb2