_disableBillingForProject = async projectName => {
  const [res] = await billing.updateProjectBillingInfo({
    name: projectName,
    resource: {billingAccountName: ''}, // Disable billing
  });
  return `Billing disabled: ${JSON.stringify(res)}`;
}
Disable billing for a project by removing its billing account
@param {string} projectName Name of project disable billing on
@return {string} Text containing response from disabling billing