chore(CI): Use pr branch for checkout. (#2774)

.github/workflows/package_for_test.yml

@@ -53,19 +53,11 @@ jobs:
         uses: actions/checkout@v3
         if: ${{ github.event_name == 'push' }}
 
-      - name: Get PR Branch
-        if: github.event_name == 'issue_comment'
-        id: comment-branch
-        uses: yanguoyu/[email protected]
-        with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-
       - name: Checkout for PR
         uses: actions/checkout@v3
         if: ${{ github.event_name == 'issue_comment' }}
         with:
-          repository: ${{ steps.comment-branch.outputs.head_owner }}/${{ steps.comment-branch.outputs.head_repo }}
-          ref: ${{ steps.comment-branch.outputs.head_ref }}
+          ref: refs/pull/${{ github.event.issue.number }}/merge
 
       - name: Setup Node
         uses: actions/setup-node@v3