feat(compiler): mark @NgModules in provider lists for identification at runtime (#22005)

All of the providers in a module get compiled into a module definition in the
factory file. Some of these providers are for the actual module types, as those
are available for injection in Angular. For tree-shakeable tokens, the runtime
needs to be able to distinguish which modules are present in an injector.

This change adds a NodeFlag which tags those module providers for later
identification.

PR Close #22005

packages/compiler/src/view_compiler/provider_compiler.ts

@@ -29,6 +29,9 @@ export function providerDef(ctx: OutputContext, providerAst: ProviderAst): {
   if (providerAst.providerType === ProviderAstType.PrivateService) {
     flags |= NodeFlags.PrivateProvider;
   }
+  if (providerAst.isModule) {
+    flags |= NodeFlags.TypeModuleProvider;
+  }
   providerAst.lifecycleHooks.forEach((lifecycleHook) => {
     // for regular providers, we only support ngOnDestroy
     if (lifecycleHook === LifecycleHooks.OnDestroy ||