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.

Charts/entkube/Chart.yaml

@@ -0,0 +1,13 @@
+apiVersion: v2
+name: entkube
+description: A Helm chart for the EntKube multi-tenant Kubernetes management platform
+type: application
+version: 0.1.0
+appVersion: "1.0.0"
+keywords:
+  - entkube
+  - kubernetes
+  - multi-tenant
+  - blazor
+maintainers:
+  - name: EntKube Team