Revert "feat: adding Pack/Unpack acknowledgement helper fns (#895)" (backport #973)

[mergify]

This is an automatic backport of pull request #973 done by Mergify.
Cherry-pick of 08d38d4 has failed:

On branch mergify/bp/release/v3.0.x/pr-973
Your branch is up to date with 'origin/release/v3.0.x'.

You are currently cherry-picking commit 08d38d4.
  (all conflicts fixed: 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)

nothing to commit, working tree clean

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

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[colin-axner]

ah! it was never backported