Create rule that catches instances of non-templated datasources in Annotations

[diurnalist]

It's possible to declare annotations that are fetched from data sources, e.g.:

  "annotations": {
    "list": [
      {
        "datasource": {
          "type": "prometheus",
          "uid": "0c52be2e-c5dd-48b3-b134-99d970fd5bc3"
        },
        "enable": true,
        "expr": "changes(kube_deployment_status_replicas{k8s_namespace_name=\"$kube_namespace\", deployment_environment=\"$env\", deployment_stack=\"$stack\"}[$__interval]) > 0",
        "iconColor": "red",
        "name": "Deployment annotations",
        "titleFormat": "Deployment"
      },
      {
        "builtIn": 1,
        "datasource": {
          "type": "grafana",
          "uid": "-- Grafana --"
        },
        "enable": true,
        "hide": true,
        "iconColor": "rgba(0, 211, 255, 1)",
        "name": "Annotations & Alerts",
        "type": "dashboard"
      }
    ]
  },

Similar to the panel-template-datasource rule, we could have an annotations-template-datasource rule, or perhaps the rule should be expanded to handle ALL instances of this issue, whether it be in templating, annotations, or panels.