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ARROW-16667: [CI][Release] Post merge script should not be necessary (#13593)

With new workflow we should always use `archery release cherry-pick` instead of cherrypicking manually.
The maintenance branch should be updated with the corresponding commits for the release candidate also for patches and we should not manually merge the changes to the branch anymore.

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>