[data-connect] Error property is missing in ExecuteGraphqlResponse

[cngeru]

• Firebase Admin version: 13.5.0
• Firebase Product: data-connect
• Node.js version: 22

The error property is missing in the ExecuteGraphqlResponse<GraphqlResponse> interface

const result = await dataConnect.insert("TableName", Variables);

result.errors is not available despite the documentation stating it should be present here