test(mc): Multi-Cloud multi-cluster single Grafana

[SRodi]

Description

Create a multi cloud multi cluster deployment where each cluster has a deployment of Prometheus and Retina. Each cluster exposes Prometheus as a load balancer. Both load balancers are connected to a single instance of Grafana to visualize retina network observability metrics.

• Add module for Kubernetes load balancer service used by AKS and GKE Prometheus instances
• Automate the data source config via Grafana module
• Add module for Azure Network Security Group
• Add module for Google Cloud Firewall
• Update retina-gke and retina-aks live stacks

Related Issue

#1267

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