[Backport 3.1] Refactor stats ITs to reset before running

[opensearch-trigger-bot]

Backport ba374d5 from #1425

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.08%. Comparing base (c480080) to head (480373b).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.1    #1467      +/-   ##
============================================
+ Coverage     80.06%   80.08%   +0.02%     
  Complexity     2184     2184              
============================================
  Files           159      159              
  Lines          8326     8326              
  Branches       1346     1346              
============================================
+ Hits           6666     6668       +2     
+ Misses         1143     1139       -4     
- Partials        517      519       +2     

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[q-andy]

Nevermind, had a chat with @martin-gaievski, don't think we need to backport this and in general we shouldn't backport non critical fixes, similar to situation encountered in opensearch-project/search-relevance#171. For my purposes I can cherrypick the commit on local. We can close this without merging, sorry for the trouble!

[heemin32]

Yes. I thought that as this is a change only in testing, it might be okay to merge.