[PR] ci: add a label-triggered luceneutil benchmark workflow for pull requests [lucene]

["owaiskazi19 (via GitHub)" <gi...@apache.org>]

owaiskazi19 opened a new pull request, #16894:
URL: https://github.com/apache/lucene/pull/16894

   ### Description
   
   - Part of #16398: committers can benchmark a PR by adding a label.
   - luceneutil compares the PR's head commit against its merge base on a GitHu runner and posts the results as a PR comment
   
   Usage
     - benchmark:luceneutil-1m is for judging a change.
     - benchmark:luceneutil-10k is a smoke test.
     - To re-run, remove the label and add it back.
     
   Tested on fork https://github.com/owaiskazi19/lucene/pull/6
   
   A committer needs to create the two labels `benchmark:luceneutil-1m` and  `benchmark:luceneutil-10k`.
   


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