refactor: convert auth_sso files to ts (#28349)

- convert js files to ts
- update types

Fixes #21311

e2e-tests/cypress/tests/integration/channels/enterprise/auth_sso/authentication_spec.ts

@@ -10,13 +10,14 @@
 // Stage: @prod
 // Group: @channels @enterprise @system_console @authentication
 
+import {Team} from '@mattermost/types/teams';
 import * as TIMEOUTS from '../../../../fixtures/timeouts';
 
 import {getRandomId} from '../../../../utils';
 
 describe('Authentication', () => {
     const restrictCreationToDomains = 'mattermost.com, test.com';
-    let testTeam;
+    let testTeam: Team;
 
     before(() => {
         cy.apiRequireLicense();

e2e-tests/cypress/tests/integration/channels/enterprise/auth_sso/mfa_authentication_spec.ts

@@ -10,14 +10,14 @@
 // Stage: @prod
 // Group: @channels @enterprise @system_console @authentication @mfa
 
+import {UserProfile} from '@mattermost/types/users';
+import * as authenticator from 'authenticator';
 import * as TIMEOUTS from '../../../../fixtures/timeouts';
 
-const authenticator = require('authenticator');
-
 describe('Authentication', () => {
-    let mfaSysAdmin;
-    let testUser;
-    let adminMFASecret;
+    let mfaSysAdmin: UserProfile;
+    let testUser: UserProfile;
+    let adminMFASecret: string;
 
     before(() => {
         cy.apiRequireLicenseForFeature('MFA');