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/templates/clusters-service.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.clusters.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "entkube.fullname" . }}-clusters
+  labels:
+    {{- include "entkube.labels" . | nindent 4 }}
+    app.kubernetes.io/component: clusters
+spec:
+  type: ClusterIP
+  ports:
+    - port: {{ .Values.clusters.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    {{- include "entkube.selectorLabels" . | nindent 4 }}
+    app.kubernetes.io/component: clusters
+{{- end }}