Revert back to use GitHub context (#42066)

* check

* fix

---------

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

Author: ydshieh

.github/workflows/pr_slow_ci_suggestion.yml

@@ -28,13 +28,15 @@ jobs:
         with:
           fetch-depth: "0"
 
+      # We need to use `${{ ... }}` here to avoid `Argument list too long` error when a PR changes a lot of files.
+      # (We could also try to use artifact approach, but it's more involved).
+      # `CodeQL` doesn't identify any security issue here. Also `PR_FILES` is from `get-pr-info.yml` by using an api
+      # `github.rest.pulls.listFiles`, which is fine.
       - name: Write pr_files file
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const fs = require('node:fs');
-            const prFilesJson = `${{ needs.get-pr-info.outputs.PR_FILES }}`;
-            fs.writeFileSync('pr_files.txt', prFilesJson);
+        run: |
+          cat > pr_files.txt << 'EOF'
+          ${{ needs.get-pr-info.outputs.PR_FILES }}
+          EOF
 
       - name: Get repository content
         id: repo_content