Add managedIdentityResourceId to EventHubConnectionProperties (Azure#16358)

Co-authored-by: Amit Elran <[email protected]>

Author: amitelran

specification/synapse/resource-manager/Microsoft.Synapse/preview/2021-06-01-preview/kustoPool.json

@@ -3141,6 +3141,10 @@
         "provisioningState": {
           "$ref": "#/definitions/ResourceProvisioningState",
           "description": "The provisioned state of the resource."
+        },
+        "managedIdentityResourceId": {
+          "type": "string",
+          "description": "The resource ID of a managed identity (system or user assigned) to be used to authenticate with event hub."
         }
       },
       "required": [