chore(client): ts-migrate Challenges/utils test (#44672)

* chore(challenges-utils): Change test util file extension

* chore(challenges-utils): typescript migration of Challenges util test

client/src/templates/Challenges/utils/index.test.ts

@@ -1,9 +1,8 @@
+import { getGuideUrl } from './index';
 import envData from '../../../../../config/env.json';
 
 const { forumLocation } = envData;
 
-const { getGuideUrl } = require('./');
-
 describe('index', () => {
   describe('getGuideUrl', () => {
     it('should use forum topic url when forumTopicId is supplied', () => {

client/src/templates/Challenges/utils/index.ts

@@ -3,7 +3,7 @@ import envData from '../../../../../config/env.json';
 const { forumLocation } = envData;
 
 interface GuideData {
-  forumTopicId: number;
+  forumTopicId?: number;
   title?: string;
 }