[chore] add more validation tests to mdatagen

[dmathieu]

This is kind of a continuation of #15025, adding validation tests that were missing.

[codspeed-hq]

Merging this PR will improve performance by 27.17%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
✅ 6 untouched benchmarks
⏩ 76 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	BenchmarkBatchMetricProcessor2k	175.4 ms	137.9 ms	+27.17%

---

_{Comparing dmathieu:mdatagen-validation-tests (2ff495a) with main (4d17eb8)}

Footnotes

1. 76 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.23%. Comparing base (a58f96f) to head (2ff495a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15026      +/-   ##
==========================================
+ Coverage   91.22%   91.23%   +0.01%     
==========================================
  Files         697      697              
  Lines       44627    44627              
==========================================
+ Hits        40710    40715       +5     
+ Misses       2773     2771       -2     
+ Partials     1144     1141       -3     

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