Changes to Preview Import

added the optional property failed_rows to the response with the 200 status

added the optional property transactions/items/notes to the response with the 200 status

the transactions/items/amount response's property pattern ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$ was removed for the status 200

the transactions/items/fx_rate/anyOf[subschema #1] response's property pattern ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$ was removed for the status 200