Fix quorum queue drop-head dead letter order (backport #14926)

[mergify]

Prior to this PR, quorum queue at-most-once dead lettering for the overflow behaviour drop-head was dead lettering in the wrong order.

---

This is an automatic backport of pull request #14926 done by Mergify.

[mergify]

Cherry-pick of 59fdd73 has failed:

On branch mergify/bp/v4.2.x/pr-14926
Your branch is ahead of 'origin/v4.2.x' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 59fdd73d1.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   release-notes/4.2.1.md

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   release-notes/4.3.0.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally