ci: Remove Github transition comment from CI

.github/workflows/cicd-main.yml

@@ -128,42 +128,6 @@ jobs:
             echo "is_maintainer=false" | tee -a $GITHUB_OUTPUT
           fi
 
-      - name: Find Comment
-        uses: peter-evans/find-comment@v4
-        if: startsWith(github.ref, 'refs/heads/pull-request/')
-        id: fc
-        with:
-          issue-number: ${{ fromJSON(steps.get-pr-info.outputs.pr-info || '{}').number }}
-          repository: ${{ github.repository }}
-          body-includes: "<!--external-contributor-comment-->"
-
-      - name: Delete comment
-        uses: actions/github-script@v7
-        if: startsWith(github.ref, 'refs/heads/pull-request/') && steps.fc.outputs.comment-id != ''
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            await github.rest.issues.deleteComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              comment_id: ${{ steps.fc.outputs.comment-id }}
-            })
-
-      - name: Write pull request comment
-        if: startsWith(github.ref, 'refs/heads/pull-request/') && steps.check-membership.outputs.is_maintainer == 'false'
-        uses: peter-evans/create-or-update-comment@v5
-        with:
-          issue-number: ${{ fromJSON(steps.get-pr-info.outputs.pr-info || '{}').number }}
-          repository: ${{ github.repository }}
-          body: |
-            <!--external-contributor-comment-->
-
-            Thank you for your contribution!
-
-            NVIDIA Megatron-LM is currently transitioning to development on Github. We will aim to review your PR after we complete our transition and stabilize our Github development process.
-
-            Thank you for your understanding.
-
   pre-flight:
     needs: [is-not-external-contributor]
     if: github.repository == 'NVIDIA/Megatron-LM'