feat(Merge Node): Overhaul, v3 (#9528)

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Shireen Missi <94372015+ShireenMissi@users.noreply.github.com>

packages/nodes-base/nodes/Merge/v3/actions/mode/append.ts

@@ -0,0 +1,32 @@
+import {
+	type IExecuteFunctions,
+	type INodeExecutionData,
+	type INodeProperties,
+} from 'n8n-workflow';
+
+import { updateDisplayOptions } from '@utils/utilities';
+
+import { numberInputsProperty } from '../../helpers/descriptions';
+
+export const properties: INodeProperties[] = [numberInputsProperty];
+
+const displayOptions = {
+	show: {
+		mode: ['append'],
+	},
+};
+
+export const description = updateDisplayOptions(displayOptions, properties);
+
+export async function execute(
+	this: IExecuteFunctions,
+	inputsData: INodeExecutionData[][],
+): Promise<INodeExecutionData[]> {
+	const returnData: INodeExecutionData[] = [];
+
+	for (let i = 0; i < inputsData.length; i++) {
+		returnData.push.apply(returnData, inputsData[i]);
+	}
+
+	return returnData;
+}