message: add xms-ids for postgresqlhsc
diff: "items": {
  "$ref": "#/definitions/ServerRoleGroup"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "minItems": 1,
  "maxItems": 2,
  "uniqueItems": true
  "items": {
  "$ref": "#/definitions/ServerNameItem"
  },
  + "x-ms-identifiers": [
  + "name"
  + ],
  "readOnly": true,
  "uniqueItems": true
  }
  "items": {
  "$ref": "#/definitions/ServerRoleGroupConfiguration"
  },
  + "x-ms-identifiers": [],
  "uniqueItems": true
  }
  },
  "type": "array",
  "items": {
  "$ref": "#/definitions/Operation"
  - }
  + },
  + "x-ms-identifiers": [
  + "name"
  + ]
  },
  "nextLink": {
  "description": "URL client should use to fetch the next page (per server side paging).\r\nIt's null for now, added for future use.",
  "description": "A list of additional details about the error.",
  "items": {
  "$ref": "#/definitions/CloudErrorBody"
  - }
  + },
  + "x-ms-identifiers": [
  + "code"
  + ]
  }
  }
  }
  