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

* Migrating admin_definition from jsx to tsx

* Fixing types and errors

* Fixing all the types errors

* Fixing linter errors

* Removing no longer needed yup dependency

* Moving admin_definition types to its own file

* Removing a couple of anys

* Fixing linter errors

* Fixing tests snapshots

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.jsx';
+import AdminDefinition from 'components/admin_console/admin_definition';
 
 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.jsx';
+import AdminDefinition from 'components/admin_console/admin_definition';
 
 describe('Selectors.AdminConsole', () => {
     describe('get admin definitions', () => {