Spawning a ConsistentHashPool hangs when the underlying actor type is not registered in DI container

[pierre-sts]

Summary

Calls to Spawn on ConsistentHashPool props hang if:

1. The underlying routee actor props are acquired through dependency injection, and
2. The underlying routee type is not properly registered with the DI container.

The expected behavior would be an exception such as: System.InvalidOperationException: No service for type 'MyActor' has been registered.

How to reproduce the issue

Create a plain vanilla ASP NET Core Web App project with the following code:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSingleton(provider => new ActorSystem().WithServiceProvider(provider));
// builder.Services.AddTransient<MyActor>();  <-- commenting this out makes the spawn hang

var app = builder.Build();

var actorSystem = app.Services.GetService<ActorSystem>();

var optionProps = actorSystem.DI().PropsFor<MyActor>();
var poolProps = actorSystem.Root.NewConsistentHashPool(optionProps, 2);
var poolId = actorSystem.Root.Spawn(poolProps); // <-- this is the call that hangs

app.MapGet("/", () => "Hello World!");

actorSystem.Root.Send(poolId, "hello");

app.Run();