test: move platform-server integration test (#22810)

Now it lives in our standard location for tests against npm packages

PR Close #22810

integration/platform-server/src/helloworld/app.ts

@@ -0,0 +1,20 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {NgModule} from '@angular/core';
+import {BrowserModule} from '@angular/platform-browser';
+
+import {HelloWorldComponent} from './hello-world.component';
+
+@NgModule({
+  declarations: [HelloWorldComponent],
+  bootstrap: [HelloWorldComponent],
+  imports: [BrowserModule.withServerTransition({appId: 'hlw'})],
+})
+export class HelloWorldModule {
+}