fix(ivy): reexport compileNgModuleFactory__POST_NGCC__ to prevent DCE in FESM (#26071)

While creating FESM files, rollup usually drops all unused symbols.
All *__POST_NGCC__ are unused unless ngcc rewires stuff. To prevent this DCE
we reexport them as private symbols. If ngcc is not used, these symbols will
be dropped when we optimize an application bundle.

PR Close #26071

packages/core/src/application_ref.ts

@@ -43,7 +43,7 @@ function compileNgModuleFactory__PRE_NGCC__<M>(
   return compiler.compileModuleAsync(moduleType);
 }
 
-function compileNgModuleFactory__POST_NGCC__<M>(
+export function compileNgModuleFactory__POST_NGCC__<M>(
     injector: Injector, options: CompilerOptions,
     moduleType: Type<M>): Promise<NgModuleFactory<M>> {
   ngDevMode && assertNgModuleType(moduleType);