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/cli/test/integration/shared/utils/testServer.ts

@@ -1,6 +1,5 @@
 import { Container } from 'typedi';
 import cookieParser from 'cookie-parser';
-import bodyParser from 'body-parser';
 import express from 'express';
 import { LoggerProxy } from 'n8n-workflow';
 import type superagent from 'superagent';
@@ -31,7 +30,7 @@ import {
 	TagsController,
 	UsersController,
 } from '@/controllers';
-import { setupAuthMiddlewares } from '@/middlewares';
+import { rawBody, jsonParser, setupAuthMiddlewares } from '@/middlewares';
 
 import { InternalHooks } from '@/InternalHooks';
 import { LoadNodesAndCredentials } from '@/LoadNodesAndCredentials';
@@ -119,6 +118,9 @@ export const setupTestServer = ({
 	enabledFeatures,
 }: SetupProps): TestServer => {
 	const app = express();
+	app.use(rawBody);
+	app.use(cookieParser());
+
 	const testServer: TestServer = {
 		app,
 		httpServer: app.listen(0),
@@ -137,10 +139,6 @@ export const setupTestServer = ({
 		mockInstance(InternalHooks);
 		mockInstance(PostHogClient);
 
-		app.use(bodyParser.json());
-		app.use(bodyParser.urlencoded({ extended: true }));
-		app.use(cookieParser());
-
 		config.set('userManagement.jwtSecret', 'My JWT secret');
 		config.set('userManagement.isInstanceOwnerSetUp', true);
 
@@ -155,6 +153,8 @@ export const setupTestServer = ({
 
 		if (!endpointGroups) return;
 
+		app.use(jsonParser);
+
 		const [routerEndpoints, functionEndpoints] = classifyEndpointGroups(endpointGroups);
 
 		if (routerEndpoints.length) {