Add new Harbomaster build plans to execute the cypress tests

In order to execute the cypress tests for swh-web, some dedicated Harbomaster build plans must be created.

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Migrated from T1911 (view on Phabricator)

assigned to @anlambert

marked this issue as related to #1841 (closed)

added Continuous Integration Web app priority:Normal labels

Build plan for new commits: https://forge.softwareheritage.org/harbormaster/plan/7/

Build plan for Phabricator Diffs: https://forge.softwareheritage.org/harbormaster/plan/8/

closed