[MM-52821] Migrate components/app.jsx to Typescript (#23605)

Co-authored-by: Iliès BELDJILALI <ibeldjilali@takima.fr>
Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/webpack.config.js

@@ -376,7 +376,7 @@ async function initializeModuleFederation() {
 
     // Desktop specific code for remote module loading
     moduleFederationPluginOptions.exposes = {
-        './app': 'components/app.jsx',
+        './app': 'components/app',
         './store': 'stores/redux_store.jsx',
         './styles': './src/sass/styles.scss',
         './registry': 'module_registry',