Validate a monitor user template

Example request

{
  "data": {
    "attributes": {
      "description": "This is a template for monitoring user activity.",
      "monitor_definition": {
        "message": "You may need to add web hosts if this is consistently high.",
        "name": "Bytes received on host0",
        "query": "avg(last_5m):sum:system.net.bytes_rcvd{host:host0} > 100",
        "type": "query alert"
      },
      "tags": [
        "product:Our Custom App",
        "integration:Azure"
      ],
      "template_variables": [
        {
          "available_values": [
            "value1",
            "value2"
          ],
          "defaults": [
            "defaultValue"
          ],
          "name": "regionName",
          "tag_key": "datacenter"
        }
      ],
      "title": "Postgres CPU Monitor"
    },
    "type": "monitor-user-template"
  }
}