refactor: Delete a lot of unused and duplicate code in Server and WebhookServer (#5080)

* store n8n version string in a const and use that everywhere

* reduce code duplication between Server and WebhookServer

* unify redis checks

* fix linting

packages/cli/src/ErrorReporting.ts

@@ -1,4 +1,3 @@
-import type { Application } from 'express';
 import config from '@/config';
 import { ErrorReporterProxy } from 'n8n-workflow';
 
@@ -44,11 +43,3 @@ export const initErrorHandling = async () => {
 
 	initialized = true;
 };
-
-export const setupErrorMiddleware = async (app: Application) => {
-	const {
-		Handlers: { requestHandler, errorHandler },
-	} = await import('@sentry/node');
-	app.use(requestHandler());
-	app.use(errorHandler());
-};