test: deprecate react-unit-test-utils part-3

[vmnavarro94]

Description

Remove use of 'shallow' (react-unit-test-utils) in following files, when needed we also removed snapshot to create new unit tests:

• src/components/FilePreview/Banners/ErrorBanner.test.jsx
• src/components/FilePreview/Banners/LoadingBanner.test.jsx
• src/components/FilePreview/BaseRenderers/ImageRenderer.test.jsx
• src/components/FilePreview/FileInfo.test.jsx
• src/components/FilePreview/FileRenderer.test.jsx

Note: As part of this work we find out paragon components were mocked on src/setupTest.jsx causing testing library unit tests to fail, since we are doing this work in multiple PRs and in order to not break other existing snapshot tests, we will unmock paragon or needed things on new tests and by end of react-unit-test-utils removal we will remove paragon mocks and unmock lines accordingly.

Support Information

Closes #429

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b54e8ff) to head (b91e1e0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #430   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1078      1078           
  Branches       159       160    +1     
=========================================
  Hits          1078      1078           

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[arbrandes]

Very comprehensive, thank you!