backporting: Revert changes until the new workflow will be in place #28371
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The new GH workflow "Update labels of backported PRs", called from each stable branch, updates each
backport-pending
PRs to mark them asbackport-done
when the related backport is merged. So, there should be no need to use the contrib/backporting/set-labels.py to do that anymore.However, there are still some in-flight backport PRs that rely on the script to do that manually. Thus, this commit reverts the changes in 2966b03 to restore the old script code.
Once all the new GH workflows will be in place for the stable branches and the backport PRs will be created following the new format documented in the backporting docs, the script may be updated.
Fixes: 2966b03 ("backporting: Update docs after introduction of Label Updater")