message: Update swagger for SSIS-IR to support user-assigned managed identity
diff: "items": {
  "$ref": "#/definitions/PackageStore"
  }
  + },
  + "managedCredential": {
  + "description": "The user-assigned managed identity reference.",
  + "$ref": "#/definitions/EntityReference"
  }
  },
  "additionalProperties": {
  "type": "string",
  "enum": [
  "IntegrationRuntimeReference",
  - "LinkedServiceReference"
  + "LinkedServiceReference",
  + "CredentialReference"
  ],
  "x-ms-enum": {
  "name": "IntegrationRuntimeEntityReferenceType",
  