fix(Discourse Node): Fix issue with not all posts getting returned and add credential test (#3007)

* 🔨 fix for not all posts returning

* ⚡ added credential test

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Define test the new way

* ⚡ Remove not needed imports

* ⚡ Fix auth test problem

Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Ricardo Espinoza <ricardo@n8n.io>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/nodes/Zendesk/Zendesk.node.ts

@@ -1,17 +1,10 @@
-import {
-	OptionsWithUri,
-} from 'request';
-
 import {
 	IExecuteFunctions,
 } from 'n8n-core';
 
 import {
-	ICredentialsDecrypted,
-	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
-	INodeCredentialTestResult,
 	INodeExecutionData,
 	INodePropertyOptions,
 	INodeType,