Removing old backport labels in the docs repo

Not sure if a forum post on this is overkill or not but I’ve noticed we have a bunch of stale backport labels in the docs repo.

I’d imagine it’s fine to just delete labels for old versions like, say, stable-2.14. That’ll also remove the label from any associated PRs but new labels can be re-applied before merge anyway. It might also be a good time to see if we can close some older PRs or revive them.

@gotmax23 or @felixfontein Could there be any unintended consequences with patchback? I’d guess not, but would like to ask. Thanks.