feat(Webflow Trigger Node): Reduce chance of webhook duplication and add credential test (#3594)

* upstream merge

* ⚡ additional check for webhook, credentials update

* 🔥 Remove unnecessary condition

* ⚡ Change credential injection to generic type

* 👕 Fix linting issue

Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

packages/nodes-base/credentials/WebflowApi.credentials.ts

@@ -1,4 +1,6 @@
 import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
 	ICredentialType,
 	INodeProperties,
 } from 'n8n-workflow';
@@ -15,4 +17,18 @@ export class WebflowApi implements ICredentialType {
 			default: '',
 		},
 	];
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'Authorization': '=Bearer {{$credentials.accessToken}}',
+			},
+		},
+	};
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: 'https://api.webflow.com',
+			url: '/sites',
+		},
+	};
 }