Allow skipping bug bot with #skip-bugbot for PR description (#2204)

.github/workflows/bugbot-trigger.yml

@@ -8,6 +8,7 @@ jobs:
   trigger-bugbot:
     environment: ai-bots
     runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.pull_request.body, '#skip-bugbot') }}
     permissions:
       pull-requests: write
     steps: