test: deprecate react-unit-test-utils part-6

[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/containers/ResponseDisplay/PreviewDisplay.test.jsx]
• [src/containers/ResponseDisplay/SubmissionFiles.test.jsx]
• [src/containers/ResponseDisplay/components/FileExtensionCell.test.jsx]
• [src/containers/ResponseDisplay/components/FileNameCell.test.jsx]
• [src/containers/ResponseDisplay/index.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 #434

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (715cc60) to head (6d177f5).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #440   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          107       107           
  Lines         1078      1078           
  Branches       159       159           
=========================================
  Hits          1078      1078           

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