remove main branch PR

Author: ezhang6811

.github/workflows/pre-release-prepare.yml

@@ -111,23 +111,4 @@ jobs:
           
           By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice." \
                        --head v${{ github.event.inputs.version }}_release \
-                       --base release/v${MAJOR_MINOR}.x
-
-      - name: Create pull request against main for CHANGELOG
-        if: github.event.inputs.is_patch != 'true'
-        env:
-          GITHUB_TOKEN: ${{ env.BOT_TOKEN_GITHUB_RW_PATOKEN }}
-        run: |
-          git checkout -b "v${VERSION}_changelog_main"
-          
-          sed -i "s/## Unreleased/## Unreleased\n\n## ${VERSION} - $(date +%Y-%m-%d)/" CHANGELOG.md
-          git add CHANGELOG.md
-          git commit -m "Add ${VERSION} to CHANGELOG"
-          git push origin "v${VERSION}_changelog_main"
-          
-          gh pr create --title "Add ${VERSION} to CHANGELOG" \
-                       --body "This PR adds the ${VERSION} release entry to CHANGELOG.md.
-          
-          By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice." \
-                       --head v${{ github.event.inputs.version }}_changelog_main \
-                       --base main
+                       --base release/v${MAJOR_MINOR}.x