refactor(core): Parse Webhook request bodies on-demand (#6394)

Also,
1. Consistent CORS support ~on all three webhook types~ waiting webhooks never supported CORS. I'll fix that in another PR
2. [Fixes binary-data handling when request body is text, json, or xml](https://linear.app/n8n/issue/NODE-505/webhook-binary-data-handling-fails-for-textplain-files).
3. Reduced number of middleware that each request has to go through.
4. Removed the need to maintain webhook endpoints in the auth-exception list.
5. Skip all middlewares (apart from `compression`) on Webhook routes. 
6. move `multipart/form-data` support out of individual nodes
7. upgrade `formidable`
8. fix the filenames on binary-data in webhooks nodes
9. add unit tests and integration tests for webhook request handling, and increase test coverage

packages/nodes-base/test/nodes/ExecuteWorkflow.ts

@@ -1,11 +1,11 @@
 import { WorkflowExecute } from 'n8n-core';
-import type { INodeTypes, IRun } from 'n8n-workflow';
+import type { INodeTypes, IRun, IRunExecutionData } from 'n8n-workflow';
 import { createDeferredPromise, Workflow } from 'n8n-workflow';
 import * as Helpers from './Helpers';
 import type { WorkflowTestData } from './types';
 
 export async function executeWorkflow(testData: WorkflowTestData, nodeTypes: INodeTypes) {
-	const executionMode = 'manual';
+	const executionMode = testData.trigger?.mode ?? 'manual';
 	const workflowInstance = new Workflow({
 		id: 'test',
 		nodes: testData.input.workflowData.nodes,
@@ -21,9 +21,30 @@ export async function executeWorkflow(testData: WorkflowTestData, nodeTypes: INo
 		nodeExecutionOrder,
 		testData,
 	);
-	const workflowExecute = new WorkflowExecute(additionalData, executionMode);
 
-	const executionData = await workflowExecute.run(workflowInstance);
+	let executionData: IRun;
+	const runExecutionData: IRunExecutionData = {
+		resultData: {
+			runData: {},
+		},
+		executionData: {
+			contextData: {},
+			waitingExecution: {},
+			waitingExecutionSource: null,
+			nodeExecutionStack: [
+				{
+					node: workflowInstance.getStartNode()!,
+					data: {
+						main: [[testData.trigger?.input ?? { json: {} }]],
+					},
+					source: null,
+				},
+			],
+		},
+	};
+	const workflowExecute = new WorkflowExecute(additionalData, executionMode, runExecutionData);
+	executionData = await workflowExecute.processRunExecutionData(workflowInstance);
+
 	const result = await waitPromise.promise();
 	return { executionData, result, nodeExecutionOrder };
 }