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/package.json

@@ -65,6 +65,7 @@
     "@oclif/dev-cli": "^1.22.2",
     "@types/basic-auth": "^1.1.2",
     "@types/bcryptjs": "^2.4.2",
+    "@types/body-parser-xml": "^2.0.2",
     "@types/compression": "1.0.1",
     "@types/connect-history-api-fallback": "^1.3.1",
     "@types/convict": "^4.2.1",