text: Title: Improve concurrency for hack/verify-structured-logging.sh
  Body: <!-- Feature requests are unlikely to make progress as an issue.
  
  Instead, please suggest enhancements by engaging with SIGs on slack and mailing lists.
  
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  -->
  
  #### What would you like to be added:
  Improve concurrency for this script https://github.com/kubernetes/kubernetes/blob/master/hack/verify-structured-logging.sh#L52
  
  follow up from this PR: https://github.com/kubernetes/kubernetes/pull/99090
  
  #### Why is this needed:
  Speed up the execution time.
  
  /sig instrumentation testing