Refactor flaky local scoring tests

[Jauntbox]

Related issues N/A

Describe the proposed solution The current local scoring tests are flaky when xgboost models are included because the dataset used is a tiny 8-row hardcoded dataset. This can cause the train/validation splits to often contain all of a single class which causes xgboost models to throw an error.

This PR makes the dataset used a synthetic dataset of adjustable size (now 100 rows) to fix this problem.

Describe alternatives you've considered We could also have used the full hardcoded Titanic dataset, but this was much easier for me.

Additional context N/A

[codecov[bot]]

Codecov Report

Merging #501 into master will increase coverage by 1.48%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #501      +/-   ##
==========================================
+ Coverage   80.02%   81.51%   +1.48%     
==========================================
  Files         346      346              
  Lines       11782    11782              
  Branches      385      385              
==========================================
+ Hits         9429     9604     +175     
+ Misses       2353     2178     -175     

Impacted Files	Coverage Δ
...ala/com/salesforce/op/utils/tuples/RichTuple.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...alesforce/op/aggregators/TimeBasedAggregator.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...stages/impl/feature/TimePeriodMapTransformer.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...e/op/stages/impl/insights/RecordInsightsCorr.scala	0.00% <0.00%> (-98.25%)	:arrow_down:
utils/src/main/scala/com/salesforce/op/UID.scala	0.00% <0.00%> (-91.67%)	:arrow_down:
...op/stages/impl/preparators/MinVarianceFilter.scala	0.00% <0.00%> (-91.31%)	:arrow_down:
...es/src/main/scala/com/salesforce/op/OpParams.scala	0.00% <0.00%> (-85.72%)	:arrow_down:
...ala/com/salesforce/op/stages/SparkStageParam.scala	0.00% <0.00%> (-77.42%)	:arrow_down:
...a/com/salesforce/op/utils/spark/RichMetadata.scala	15.78% <0.00%> (-73.69%)	:arrow_down:
...la/com/salesforce/op/utils/spark/RichDataset.scala	15.38% <0.00%> (-70.77%)	:arrow_down:
... and 103 more

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[Jauntbox]

Oof, didn't realize you weren't a "code owner", I guess @leahmcguire needs to approve this too

[salesforce-cla[bot]]

Thanks for the contribution! It looks like @Jauntbox is an internal user so signing the CLA is not required. However, we need to confirm this.