test(angular): add support for multi-version testing (#25665)

angular/test/base/src/main.ts

@@ -0,0 +1,15 @@
+import { enableProdMode } from '@angular/core';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+import { AppModule } from './app/app.module';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+  platformBrowserDynamic()
+  .bootstrapModule(AppModule)
+  .catch(err => console.error(err));
+});