Add end to end tests for the frontend part of swh-web

While the backend part of swh-web is properly tested, its frontend part is not.

In order to ensure non regression on the archive browsing features we must implement end to end tests to check the web UI behaves as expected, using the cypress tool .

Current tests results report can be found here.

Current coverage for Javascript code can be found here.

Let's close that task when we reach 80% of code coverage (swh-environment#1411 (closed)).

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Migrated from T1768 (view on Phabricator)