Add unit tests for KubernetesCluster, Tenant, ServiceInstance, and RegisterClusterHandler

- Implement tests for KubernetesCluster including registration, connectivity status, and error handling.
- Create tests for Tenant creation, member management, and status changes.
- Add tests for ServiceInstance provisioning and state management.
- Introduce RegisterClusterHandler tests to validate registration requests and error scenarios.
- Set up project files for new test projects with necessary dependencies.

src/EntKube.Web.Client/Program.cs

@@ -0,0 +1,9 @@
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+
+var builder = WebAssemblyHostBuilder.CreateDefault(args);
+
+builder.Services.AddAuthorizationCore();
+builder.Services.AddCascadingAuthenticationState();
+builder.Services.AddAuthenticationStateDeserialization();
+
+await builder.Build().RunAsync();