message: [gha][lbt] add PR num to error msg
  Closes:
diff: @@ -170,7 +170,7 @@ jobs:
  echo "cti exit code: $ret"
  echo "::set-env name=CTI_REPRO_CMD::$cmd"
  echo "::set-env name=CTI_EXIT_CODE::$ret"
  - msg_text="*${{ github.job }}* job in ${{ github.workflow }} workflow failed."
  + msg_text="*${{ github.job }}* job in ${{ github.workflow }} workflow failed for PR $PR_NUM."
  if [ -s "report.json" ]; then
  echo "report.json start"
  cat report.json
  