Remove unwanted mocks, unmocks and deprecate react-unit-test-utils package

[diana-villalvazo-wgu]

Description

As part of deprecation of react-unit-test-utils work, as a final PR and cleanup, we did the following tasks:

• Remove general mocks for react, paragon and i18n, when needed we added mock on the required test (only 2 test cases for react).
• Remove unmocks related to react, paragon and i18n on the tests that were fixed as part of this initiative.
• We fixed some tests that were checking for FormattedMessage instead of a real text coming from messages.
• During this work we decided to refactor a repetitive code to render with IntlProvider, so we created the wrapper on testUtils to reuse on tests and avoid code be repetitive.
• We made some small improvements to use screen instead of picking selectors from the render, to follow a same syntax across the repo and following best practices from testing library.
• Remove remaining snapshots.
• Remove react-unit-test-utils package.

Support Information

Closes #423
Closes #424

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b10aa63) to head (9eab790).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #465   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1080      1080           
  Branches       160       160           
=========================================
  Hits          1080      1080           

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[brian-smith-tcril]

Thank you so much for this!

It's great to see all this getting cleaned up!

Couple little notes, once those are resolved this should be good to go!

[diana-villalvazo-wgu]

i change this to use testing library queries