Retrieve IHttpStitchingRequestInterceptor from combined services to allow override from application services (#5500)

Author: husseinraoouf

src/HotChocolate/Stitching/src/Stitching/DependencyInjection/HotChocolateStitchingRequestExecutorExtensions.cs

@@ -192,7 +192,7 @@ public static IRequestExecutorBuilder AddRemoteSchema(
                         sp => new HttpRequestClient(
                             sp.GetCombinedServices().GetRequiredService<IHttpClientFactory>(),
                             sp.GetRequiredService<IErrorHandler>(),
-                            sp.GetRequiredService<IHttpStitchingRequestInterceptor>()));
+                            sp.GetCombinedServices().GetRequiredService<IHttpStitchingRequestInterceptor>()));
 
                     services.TryAddSingleton<
                         IHttpStitchingRequestInterceptor,