AKS: Support managed Prometheus and Grafana provisioning

[mitchdenny]

Problem

The AKS hosting integration does not support provisioning Azure Monitor workspace (managed Prometheus) or Azure Managed Grafana alongside the AKS cluster.

Expected

var aks = builder.AddAzureKubernetesEnvironment("aks")
    .WithContainerInsights()    // existing: Log Analytics + Container Insights
    .WithManagedPrometheus()    // new: Azure Monitor workspace
    .WithManagedGrafana();      // new: Azure Managed Grafana

Related

Depends on monitoring Bicep (#16150). Part of AKS hosting support (PR #16088)