function cleanup_() {
  let formUrl = SpreadsheetApp.getActiveSpreadsheet().getFormUrl();
  if (!formUrl) {
    return;
  }
  ScriptApp.getProjectTriggers().forEach(function(trigger) {
    ScriptApp.deleteTrigger(trigger);
  });
  FormApp.openByUrl(formUrl)
      .deleteAllResponses()
      .setAcceptingResponses(false);
}
Cleans up the project (stop triggers, form submission, etc.)