fix(ZendeskTrigger Node): Fix deprecated targets, replaced with webhooks (#3025)

* 🔨 fix for deprecated targets

* ⚡ Move crendentials injection to the credential file

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

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

@@ -76,7 +76,6 @@ export class Zendesk implements INodeType {
 						],
 					},
 				},
-				testedBy: 'zendeskSoftwareApiTest',
 			},
 			{
 				name: 'zendeskOAuth2Api',
@@ -153,42 +152,6 @@ export class Zendesk implements INodeType {
 	};
 
 	methods = {
-		credentialTest: {
-			async zendeskSoftwareApiTest(this: ICredentialTestFunctions, credential: ICredentialsDecrypted): Promise<INodeCredentialTestResult> {
-				const credentials = credential.data;
-				const subdomain = credentials!.subdomain;
-				const email = credentials!.email;
-				const apiToken = credentials!.apiToken;
-
-				const base64Key =  Buffer.from(`${email}/token:${apiToken}`).toString('base64');
-				const options: OptionsWithUri = {
-					headers: {
-						'Content-Type': 'application/json',
-						'Authorization': `Basic ${base64Key}`,
-					},
-					method: 'GET',
-					uri: `https://${subdomain}.zendesk.com/api/v2/ticket_fields.json`,
-					qs: {
-						recent: 0,
-					},
-					json: true,
-					timeout: 5000,
-				};
-
-				try {
-					await this.helpers.request!(options);
-				} catch (error) {
-					return {
-						status: 'Error',
-						message: `Connection details not valid: ${error.message}`,
-					};
-				}
-				return {
-					status: 'OK',
-					message: 'Authentication successful!',
-				};
-			},
-		},
 		loadOptions: {
 			// Get all the custom fields to display them to user so that he can
 			// select them easily