Remove or rename push-candidate command

[andreasabel]

The hackage-cli command push-candidate is in the way of push-cabal when tab-completing hackage-cli push<TAB> or even hackage-cli push-ca<TAB>. Also, I never use it and I do not see what its purpose is when we have cabal upload.

I propose to remove it.

Alternatively, one could just move it into a legacy command group so that it is only available as hackage-cli legacy push-candidate.
Or rename it to candidate-push.

If you are a user of push-candidate, please leave a comment here how you use this feature and why it is important.
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[andreabedini]

I don't use push-candidate but having candidate-push and push-cabal would look a bit funny to me (and triggers my OCD 😂).

Rename push-candidate to push-version-candidate? Maybe push/pull-cabal could also be push/pull-revision (matching the existing check-revision).