message: Only mention merging the mergeback PR in the checklist when relevant
diff: @@ -30,7 +30,7 @@ def branch_exists_on_remote(branch_name):
  return run_git('ls-remote', '--heads', ORIGIN, branch_name).strip() != ''
  # Opens a PR from the given branch to the release branch
  -def open_pr(repo, all_commits, short_main_sha, new_branch_name, source_branch, target_branch, conductor):
  +def open_pr(repo, all_commits, short_main_sha, new_branch_name, source_branch, target_branch, conductor, include_mergeback_in_changelog):
  # Sort the commits into the pull requests that introduced them,
  # and any commits that don't have a pull request
  pull_requests = []
  @@ -79,6 +79,7 @@ def open_pr(repo, all_commits, short_main_sha, new_branch_name, source_branch, t
  body.append(' - [ ] The CHANGELOG includes all relevant, user-facing changes since the last release.')
  body.append(' - [ ] There are no unexpected commits being merged into the ' + target_branch + ' branch.')
  body.append(' - [ ] The docs team is aware of any documentation changes that need to be released.')
  + if include_mergeback_in_changelog:
  body.append(' - [ ] The mergeback PR is merged back into ' + source_branch + ' after this PR is merged.')
  title = 'Merge ' + source_branch + ' into ' + target_branch
  @@ -271,7 +272,8 @@ def main():
  new_branch_name,
  source_branch=args.source_branch,
  target_branch=args.target_branch,
  - conductor=args.conductor
  + conductor=args.conductor,
  + include_mergeback_in_changelog=not args.perform_v2_to_v1_backport
  )
  if __name__ == '__main__':
  