Revert "ci: auto-create correctness label if it does not exist"

This reverts commit e5bed81.

Author: turboFei

.github/workflows/correctness-label.yml

@@ -43,7 +43,6 @@ jobs:
             found { print }
           ')
           if printf '%s' "$section" | grep -qE -- '- \[[xX]\] Yes'; then
-            gh label create "correctness" --repo "$REPO" --color "e11d48" 2>/dev/null || true
             gh pr edit "$PR_NUMBER" --repo "$REPO" --add-label "correctness"
           else
             gh pr edit "$PR_NUMBER" --repo "$REPO" --remove-label "correctness" 2>/dev/null || true