Use the slim builder to avoid loading static assets

- We're exposing a simple gRPC endpoint for the dashboard to talk to. We can avoid loading static assets completely (which causes all kinds of problems when things get out of sync).

Fixes #2012

src/Aspire.Hosting/Dashboard/DashboardServiceHost.cs

@@ -66,7 +66,10 @@ public DashboardServiceHost(
 
         try
         {
-            var builder = WebApplication.CreateBuilder();
+            var builder = WebApplication.CreateSlimBuilder();
+
+            // Turn on HTTPS
+            builder.WebHost.UseKestrelHttpsConfiguration();
 
             // Environment
             builder.Services.AddSingleton<IEnvironmentVariables, EnvironmentVariables>();