New `connect_project_to_portfolio` mutation

You can now use the connect_project_to_portfolio mutation to connect an existing project board to a portfolio board via the API. This mutation is part of a monday.com portfolio solution and only available on Enterprise plans.

mutation {
  connect_project_to_portfolio (projectBoardId: 1234567890, portfolioBoardId: 9876543210) {
    portfolio_item_id
    request_id
    message
		success
  }
}