refactor: migrate managing_bot_accounts_spec.js ts (#28368)

- convert file to ts
- fix lint issues

e2e-tests/cypress/tests/integration/channels/enterprise/bot_accounts/managing_bot_accounts_spec.ts

@@ -13,7 +13,7 @@
 import * as TIMEOUTS from '../../../../fixtures/timeouts';
 
 describe('Managing bot accounts', () => {
-    let botName;
+    let botName: string;
 
     before(() => {
         cy.apiRequireLicenseForFeature('LDAP');