[multistage][flakytest] ResourceBasedQueriesTest.testQueryTestCasesWithH2 is flaky

observed multiple times when random timeout occurs on 3-way or more join queries.

example: https://github.com/apache/pinot/actions/runs/3660353652/jobs/6187392596
```
2022-12-09T20:09:11.9697742Z [ERROR] org.apache.pinot.query.runtime.queries.ResourceBasedQueriesTest.testQueryTestCasesWithH2[where_clause_tests, SELECT * FROM where_clause_tests_tbl WHERE intCol IN (SELECT a.intCol FROM where_clause_tests_tbl AS a JOIN where_clause_tests_tbl AS b ON a.strCol = b.strCol WHERE MOD(a.intCol, 2) = MOD(b.intCol, 2)), null](8) Time elapsed: 10.109 s <<< FAILURE!
```

Start with ResourceBasedQueriesTest.testQueryTestCasesWithH2 and review the linked GitHub Actions run. Reproduce the failure with the reported three-way-or-more join query and identify why the random timeout occurs. Done means the test no longer flakes under repeated runs and the relevant test suite passes.

Written by the indexing model from the issue text.