Cleared required fields in Condition (Azure#14607)

Co-authored-by: Avi Jerafi <avjerafi@microsoft.com>

Author: avjerafi

specification/monitor/resource-manager/Microsoft.Insights/preview/2021-02-01-preview/scheduledQueryRule_API.json

@@ -599,12 +599,7 @@
           "type": "string",
           "description": "The name of the metric to be sent. Relevant and required only for rules of the kind LogToMetric."
         }
-      },
-      "required": [
-        "operator",
-        "threshold",
-        "timeAggregation"
-      ]
+      }
     },
     "Dimension": {
       "type": "object",