Revert "refactor(@angular/ssr): add workaround for router lastSuccessfulNavigation breaking changing"

This reverts commit 2fde130.

Author: alan-agius4

packages/angular/ssr/src/utils/ng.ts

@@ -100,15 +100,7 @@ export async function renderAngular(
     const envInjector = applicationRef.injector;
     const routerIsProvided = !!envInjector.get(ActivatedRoute, null);
     const router = envInjector.get(Router);
-
-    // TODO(alanagius): Remove the below check when version 21.0.0-next.0 is on NPM
-    // Workaround for breaking change that landed on angular/angular main too early
-    // https://github.com/angular/angular/pull/63057
-    const lastSuccessfulNavigation =
-      typeof router.lastSuccessfulNavigation === 'function'
-        ? // eslint-disable-next-line @typescript-eslint/no-explicit-any
-          (router as any).lastSuccessfulNavigation()
-        : router.lastSuccessfulNavigation;
+    const lastSuccessfulNavigation = router.lastSuccessfulNavigation;
 
     if (!routerIsProvided) {
       hasNavigationError = false;