Fix combinatoric explosion in test

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.11236% with 71 lines in your changes are missing coverage. Please review.

Project coverage is 65.97%. Comparing base (d6c2569) to head (f141184).

Files	Patch %	Lines
...stributionBase/UnivariateContinuousDistribution.cs	24.39%	27 Missing and 4 partials :warning:
...cs/StatsCore/Distributions/WilcoxonDistribution.cs	27.27%	15 Missing and 1 partial :warning:
...ibutionFactories/MannWhitneyDistributionFactory.cs	61.53%	4 Missing and 1 partial :warning:
...sis/SailDiff/Statistics/StatsCore/MathOps/Tools.cs	82.75%	3 Missing and 2 partials :warning:
...is/SailDiff/Statistics/StatsCore/MathOps/Vector.cs	28.57%	4 Missing and 1 partial :warning:
...s/StatsCore/Distributions/EmpiricalDistribution.cs	62.50%	3 Missing :warning:
...StatsCore/Distributions/MannWhitneyDistribution.cs	81.25%	2 Missing and 1 partial :warning:
...CaseEvents/TestCaseCompletedNotificationHandler.cs	0.00%	2 Missing :warning:
...rs/Factories/TwoSampleWilcoxonSignedRankFactory.cs	93.75%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #165 +/- ## =========================================== + Coverage 29.86% 65.97% +36.11% =========================================== Files 269 309 +40 Lines 8086 8192 +106 Branches 1014 955 -59 =========================================== + Hits 2415 5405 +2990 + Misses 5529 2482 -3047 - Partials 142 305 +163 ```

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