Revert "Migrating the admin_definition.jsx file to typescript (#24658)" (#24869)

This reverts commit a1bf8504a8.

webapp/channels/src/selectors/admin_console.jsx

@@ -7,7 +7,7 @@ import {ResourceToSysConsolePermissionsTable, RESOURCE_KEYS} from 'mattermost-re
 import {createSelector} from 'mattermost-redux/selectors/create_selector';
 import {getMySystemPermissions} from 'mattermost-redux/selectors/entities/roles_helpers';
 
-import AdminDefinition from 'components/admin_console/admin_definition';
+import AdminDefinition from 'components/admin_console/admin_definition.jsx';
 
 export const getAdminDefinition = createSelector(
     'getAdminDefinition',

webapp/channels/src/selectors/admin_console.test.jsx

@@ -3,7 +3,7 @@
 
 import {getAdminDefinition} from 'selectors/admin_console.jsx';
 
-import AdminDefinition from 'components/admin_console/admin_definition';
+import AdminDefinition from 'components/admin_console/admin_definition.jsx';
 
 describe('Selectors.AdminConsole', () => {
     describe('get admin definitions', () => {