feat: migrate enzyme to RTL

[KyryloKireiev]

This PR deprecates enzyme and shift all test cases to react testing library (RTL).

closes #440

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.74%. Comparing base (eea956d) to head (426a697).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
+ Coverage   73.73%   74.74%   +1.01%     
==========================================
  Files           3        3              
  Lines          99       99              
  Branches       29       29              
==========================================
+ Hits           73       74       +1     
+ Misses         20       19       -1     
  Partials        6        6              

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[GlugovGrGlib]

LGTM!

[edx-semantic-release]

🎉 This PR is included in version 2.6.0 🎉

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