Remove document on go back click on step 1

Invoke onBackStep on "go back" click and conditionally render go back label

packages/ui/primitives/document-flow/add-fields.tsx

@@ -566,7 +566,9 @@ export const AddFieldsFormPartial = ({
           onGoBackClick={() => {
             previousStep();
             remove();
+            documentFlow.onBackStep?.();
           }}
+          goBackLabel={currentStep === 1 && typeof documentFlow.onBackStep === "function" ? "Remove" : undefined}
           onGoNextClick={() => void onFormSubmit()}
         />
       </DocumentFlowFormContainerFooter>