test: fix flaky `Team join` api tests (#32634)

apps/meteor/tests/data/users.helper.js

@@ -5,8 +5,8 @@ import { MongoClient } from 'mongodb';
 import { URL_MONGODB } from '../e2e/config/constants';
 
 export const createUser = (userData = {}) =>
-	new Promise((resolve) => {
-		const username = userData.username || `user.test.${Date.now()}`;
+	new Promise((resolve, reject) => {
+		const username = userData.username || `user.test.${Date.now()}.${Math.random()}`;
 		const email = userData.email || `${username}@rocket.chat`;
 		request
 			.post(api('users.create'))

apps/meteor/tests/end-to-end/api/25-teams.js

@@ -1602,9 +1602,10 @@ describe('[Teams]', () => {
 			let testUser2;
 
 			before(async () => {
-				const [testUserResult, testUser1Result] = await Promise.all([createUser(), createUser()]);
-				testUser1 = testUserResult;
-				testUser2 = testUser1Result;
+				const [testUser1Result, testUser2Result] = await Promise.all([createUser(), createUser()]);
+
+				testUser1 = testUser1Result;
+				testUser2 = testUser2Result;
 			});
 
 			beforeEach(async () => {