Deprecate react-unit-test-utils package

[diana-villalvazo-wgu]

Description
Remove react-unit-test-utils package

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

Support Information
Closes #1728

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.51%. Comparing base (b050535) to head (48b63b4).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1758      +/-   ##
==========================================
+ Coverage   90.46%   90.51%   +0.04%     
==========================================
  Files         344      344              
  Lines        5812     5830      +18     
  Branches     1360     1362       +2     
==========================================
+ Hits         5258     5277      +19     
+ Misses        537      536       -1     
  Partials       17       17              

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