Disable the cherry-pick bot (apache#8799)

---

*Motivation*

Disable the cherry-pick bot. Because of the cherry-pick bot
will change the author of the PR and maybe need another way
to do the cherry-pick automatically.

.github/workflows/ci-pulsarbot.yaml

@@ -47,26 +47,3 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.PULSARBOT_TOKEN }}
         uses: apache/pulsar-test-infra/pulsarbot@master
-
-      # Just use a github user who has permission to create a branch on the apache/pulsar repo.
-      # We can consider creating a bot user to do this.
-      - name: Cherry-pick prompt
-        if: github.event_name == 'pull_request' && github.event.pull_request.merged == true
-        uses: apache/pulsar-test-infra/cherry-pick@master
-        env:
-          GITHUB_TOKEN: ${{ secrets.PULSARBOT_TOKEN }}
-        with:
-          type: prompt-comment
-          github_user: codelipenghui
-          github_email: '[email protected]'
-          github_repos: 'apache/pulsar'
-
-      - name: Cherry-pick
-        if: github.event_name == 'issue_comment' && startsWith(github.event.comment.body, '/pulsarbot cherry-pick')
-        uses: apache/pulsar-test-infra/cherry-pick@master
-        env:
-          GITHUB_TOKEN: ${{ secrets.PULSARBOT_TOKEN }}
-        with:
-          github_user: codelipenghui
-          github_email: '[email protected]'
-          github_repos: 'apache/pulsar'