feat: use default-app behavior in packaged apps (#16310)

Unify the behavior between default app and packaged apps:
- create default application menu unless the app has one
- default window-all-closed handling unless the app handles the event

spec/fixtures/api/window-all-closed/main.js

@@ -0,0 +1,20 @@
+const { app, BrowserWindow } = require('electron')
+
+let handled = false
+
+if (app.commandLine.hasSwitch('handle-event')) {
+  app.on('window-all-closed', () => {
+    handled = true
+    app.quit()
+  })
+}
+
+app.on('quit', () => {
+  process.stdout.write(JSON.stringify(handled))
+  process.stdout.end()
+})
+
+app.on('ready', () => {
+  const win = new BrowserWindow()
+  win.close()
+})