feat(Magento 2 Node): Add credential tests (#3086)

* Implements Magento Auth API Test

* Deletes unit tests

* Fixed lint issues and changed the URI for the credential test

* ⚡ Move credential verification to the credential file

* ⚡ Simplify code

Co-authored-by: paolo-rechia <paolo@e-bot7.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/nodes/Magento/Magento2.node.ts

@@ -1,10 +1,18 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+
 import {
 	IExecuteFunctions,
 } from 'n8n-core';
 
 import {
+	ICredentialsDecrypted,
+	ICredentialTestFunctions,
 	IDataObject,
 	ILoadOptionsFunctions,
+	INodeCredentialTestResult,
 	INodeExecutionData,
 	INodePropertyOptions,
 	INodeType,