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/default-menu/main.js

@@ -0,0 +1,32 @@
+const { app, Menu } = require('electron')
+
+function output (value) {
+  process.stdout.write(JSON.stringify(value))
+  process.stdout.end()
+
+  app.quit()
+}
+
+try {
+  let expectedMenu
+
+  if (app.commandLine.hasSwitch('custom-menu')) {
+    expectedMenu = new Menu()
+    Menu.setApplicationMenu(expectedMenu)
+  } else if (app.commandLine.hasSwitch('null-menu')) {
+    expectedMenu = null
+    Menu.setApplicationMenu(null)
+  }
+
+  app.on('ready', () => {
+    setImmediate(() => {
+      try {
+        output(Menu.getApplicationMenu() === expectedMenu)
+      } catch (error) {
+        output(null)
+      }
+    })
+  })
+} catch (error) {
+  output(null)
+}