Build sklearn pipeline tests for visualizers - Part 2

[pdamodaran]

This PR fixes #1256 (If you are fixing a bug) which reported a bug that caused a problem to occur when users...

(or if you are introducing a new feature) which requested a feature to allow the user to...

I have made the following changes:

1. Added pipeline tests for Prediction Error
2. Added pipeline tests for InterClusterDistanceMetric

TODOs and questions

Still to do:

• [x] Add quick method pipeline tests for PredictionError and InterClusterDistanceMetric
• [ ] Add a pipeline model input test and quick method test for InterClusterDistanceMetric
• [ ] Add tests for KElbowVisualizer
• [ ] Add tests for SilhouetteVisualizer
• [ ] Add tests for GridSearchColorPlot

Questions for the @DistrictDataLabs/team-oz-maintainers:

• [ ]
• [ ]

CHECKLIST

• [ x] Is the commit message formatted correctly?
• [ ] Have you noted the new functionality/bugfix in the release notes of the next release?

• [x] Included a sample plot to visually illustrate your changes?
• [x] Do all of your functions and methods have docstrings?
• [x] Have you added/updated unit tests where appropriate?
• [x] Have you updated the baseline images if necessary?
• [x] Have you run the unit tests using pytest?
• [x] Is your code style correct (are you using PEP8, pyflakes)?
• [ ] Have you documented your new feature/functionality in the docs?

[codecov[bot]]

Codecov Report

Merging #1262 (a86ddaf) into develop (f60f847) will increase coverage by 0.05%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1262      +/-   ##
===========================================
+ Coverage    90.75%   90.81%   +0.05%     
===========================================
  Files           93       93              
  Lines         5301     5301              
===========================================
+ Hits          4811     4814       +3     
+ Misses         490      487       -3     

Impacted Files	Coverage Δ
yellowbrick/cluster/icdm.py	95.27% <0.00%> (+0.78%)	:arrow_up:
yellowbrick/regressor/prediction_error.py	96.72% <0.00%> (+3.27%)	:arrow_up:

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[pdamodaran]

Thanks for catching that @lwgray! I have added it to the TODO list. The visualizer will likely need to be modified for it to work.