Merge branch '214780-limit-commits-used-in-signature-updating' into 'master'

Limit commits used in signature updating

Closes #214780

See merge request gitlab-org/gitlab!30563

app/services/git/branch_hooks_service.rb

@@ -112,7 +112,7 @@ module Git
     end
 
     def enqueue_update_signatures
-      unsigned = unsigned_x509_shas(commits) & unsigned_gpg_shas(commits)
+      unsigned = unsigned_x509_shas(limited_commits) & unsigned_gpg_shas(limited_commits)
       return if unsigned.empty?
 
       signable = Gitlab::Git::Commit.shas_with_signatures(project.repository, unsigned)