[WIP] Bootstrap end to end tests with cypress

Setup an environment to perform end to end tests using the cypress Test Runner.

Before running the tests, Software Heritage web application is executed in the background using in-memory storages for fetching data contained in a sample archive.

To easily run the tests, two new make targets have been added:

• test-frontend: Run tests in headless mode (this should be used in a CI environment)
• test-frontend-ui: Run tests using the cypress GUI

As an example, a couple of tests regarding the highlighting of lines of code have been added.

Related #1768 (closed)

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Migrated from D1565 (view on Phabricator)

Build is green See https://jenkins.softwareheritage.org/job/DWAPPS/job/tox/477/ for more details.

Update: Remove unused file and resentence some tests description

Build is green See https://jenkins.softwareheritage.org/job/DWAPPS/job/tox/478/ for more details.

Update: Ensure grecaptcha is desactivated for e2e tests

Build is green See https://jenkins.softwareheritage.org/job/DWAPPS/job/tox/479/ for more details.

Some references in the commit message have been migrated:

• T1768 is now #1768 (closed)
• D1565 is now !118 (closed)

mentioned in commit 9ff9c023

• Add tests

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revert last commit

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mentioned in merge request !120 (closed)

mentioned in merge request !110 (closed)

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approved this merge request

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closed