mutation RemoveGitLabProjectWebhook($projectId: ID!) {
  removeGitLabProjectWebhook(projectId: $projectId) {
    id
    name
    pathWithNamespace
    webUrl
    defaultBranch
    visibility
  }
}

{
  "projectId": "id"
}

{
  "data": {
    "removeGitLabProjectWebhook": {
      "id": "id",
      "name": "string",
      "pathWithNamespace": "string",
      "webUrl": "string",
      "defaultBranch": "string",
      "visibility": "string"
    }
  }
}