Deprecate react-unit-test-utils package

[diana-villalvazo-wgu]

Description

As part of the react-unit-test-utils deprecation, after removing all the use cases, we remove react-unit-test-utils package from the repo 🎉

Do not merge until #1750 and #1751 are merged and we rebase master Done ✅

Support Information

Closes #1728

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.38%. Comparing base (33d7d66) to head (7b18d33).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1758   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files         344      344           
  Lines        5811     5811           
  Branches     1396     1393    -3     
=======================================
  Hits         5252     5252           
  Misses        540      540           
  Partials       19       19           

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[brian-smith-tcril]

Perfect!

Let's