chore: provide random id when generating feeds credentials (#2037)

### 💡 Overview

### 📝 Implementation notes

🎫 Ticket:
https://linear.app/stream/issue/REACT-697/create-feeds-credentials-for-tutorial

📑 Docs: https://github.com/GetStream/docs-content/pull/<id>

Author: szuperaz

sample-apps/react/react-dogfood/pages/api/call/sample.ts

@@ -46,7 +46,9 @@ async function createSampleAppCall(req: NextApiRequest, res: NextApiResponse) {
   const appConfig = getEnvironmentConfig(data.app_type);
 
   const userName = getRandomName();
-  const userId = toUserId(userName);
+  // Feeds tutorial needs unique user ids (we use user id as feed id)
+  const userId =
+    data.app_type === 'feedsv3' ? crypto.randomUUID() : toUserId(userName);
   const token = await createToken(userId, appConfig.apiKey, appConfig.secret);
   const buddyUserName = getBuddyUserName(userName);
   const buddyUserId = toUserId(buddyUserName);