Add RimSummaryEnsemble-Test.cpp with tests verifying that:
- a realization whose calculated summary vector value is NaN or Inf
at the selected timestep is excluded from the Pearson correlation
result instead of corrupting it
- extremely large but finite parameter/result magnitudes, which
overflow the sum-of-squares in RigStatisticsTools::pearsonCorrelation()
and RigEnsembleParameter::stdDeviation(), do not surface a NaN/Inf
correlation value and are not silently dropped from the result
Add RigStatisticsTools.OverflowProducesNan reproducing the pearsonCorrelation()
overflow directly.
Verified each new test fails without its corresponding production fix
and passes with it.
