Parallel test runners for Cypress tests

[taoeffect]

Problem

The tests take way too long and we want to test more of the frontend.

Solution

Replace the current matrix (arm + x86 linux) with multiple test runners per: https://www.cypress.io/blog/how-to-execute-test-cases-in-parallel-with-cypress-cloud-using-github-ci-cd-actions

(Split the different Cypress specs across different machines)