Execute cypress tests in parallel on Jenkins

Cypress overall tests execution is quite long as they are sequentially ran by default.

In order to speedup tests execution, they can be run in parallel using multiple test executors.

Nevertheless, this requires to use the Cypress dashboard that cannot be self hosted and is quite limited for its free pricing plan.

Fortunately, it exists the sorry-cypress open source project enabling to run parallel cypress tests while being self hostable. We should consider using it to speedup cypress tests on Jenkins.

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Migrated from T3423 (view on Phabricator)