refactor: convert channel_moderation files to ts (#28482)

* refactor: convert channel_moderation files to ts

- convert js files to ts
- update data types accordingly
- fix lint issues

Fixes: #21332

* fix: update argument type for visitChannel

- update type
- fix types issues

* refactor: change return type for getAdminAccount()

- change return type to getAdminAccount as UserProfile

e2e-tests/cypress/tests/support/external_commands.ts

@@ -13,7 +13,7 @@ import {getRandomId} from '../utils';
 function externalActivateUser(userId: string, active = true) {
     const admin = getAdminAccount();
 
-    cy.externalRequest({user: admin, method: 'PUT', path: `users/${userId}/active`, data: {active}});
+    return cy.externalRequest({user: admin, method: 'PUT', path: `users/${userId}/active`, data: {active}});
 }
 Cypress.Commands.add('externalActivateUser', externalActivateUser);