Skip screenshot tests in CI

[nbierdeman]

Description

This PR is a compromise, but a reasonable one, in my opinion. Jest screenshot tests pass locally, but fail in CI. Valiant attempts were made at fixing them (please see the commit history for excruciating detail), but it was ultimately decided by Product that it was time to move on. Instead, screenshot tests run locally in a pre-push hook, but are skipped in CI, including when git push is run in CI. Another way of thinking of these changes is every step in npm run test happens between the local pre-push hook and the GitHub Actions tasks. If all goes well, this should unblock publishing v4 using GitHub Actions.

Why are we making these changes? Include references to any related Jira tasks or GitHub Issues

DTPPCPSDK-1978

Screenshots

Here you can see the pre-push hook running screenshot tests locally:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (v4@6eca4ac). Click here to learn what that means.

Additional details and impacted files

@@          Coverage Diff          @@
##             v4    #2348   +/-   ##
=====================================
  Coverage      ?   69.17%           
=====================================
  Files         ?       92           
  Lines         ?     3105           
  Branches      ?      183           
=====================================
  Hits          ?     2148           
  Misses        ?      877           
  Partials      ?       80           

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[jshawl]

a commendable effort and a clever compromise!