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

angular/test/base/src/main.server.ts

@@ -0,0 +1,10 @@
+import { enableProdMode } from '@angular/core';
+
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+export { AppServerModule } from './app/app.server.module';
+export { renderModule, renderModuleFactory } from '@angular/platform-server';