Merge branch '226924-gitaly-n-1-queries-in-mergerequests-draftscontroller-4' into 'master'

Make keep around service commit's unique

See merge request gitlab-org/gitlab!70323

lib/gitlab/git/keep_around.rb

@@ -19,7 +19,7 @@ module Gitlab
       end
 
       def execute(shas)
-        shas.each do |sha|
+        shas.uniq.each do |sha|
           next unless sha.present? && commit_by(oid: sha)
 
           next if kept_around?(sha)