Dhaiman aad flag added to la workspace (Azure#14637)

* Update Workspaces.json

* Update Workspaces.json

* Update Workspaces.json

Author: dhaiman

specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2020-10-01/Workspaces.json

@@ -590,6 +590,11 @@
           "type": "string",
           "x-nullable": true,
           "description": "Dedicated LA cluster resourceId that is linked to the workspaces."
+        },
+        "disableLocalAuth": {
+          "type": "boolean",
+          "x-nullable": true,
+          "description": "Disable Non-AAD based Auth."
         }
       },
       "additionalProperties": true,