[learn] add better support for mass challenge testing

[Sembauke]

Is your feature request related to a problem? Please describe.

Setting up a mass testing environment for challenges of a specific certification can be a cumbersome process at the moment.

Describe the solution you'd like

Consider developing a bash script that automates the execution process and streamlines the handling of test files. Such a script would simplify the setup and make mass testing of certification challenges more convenient.

Describe alternatives you've considered

It would be highly beneficial to have clear and concise documentation that provides step-by-step instructions for setting up the environment correctly. This documentation would ensure that users can easily follow the necessary procedures and avoid any potential pitfalls during the setup process.

Additional context
Currently when testing a new addition of any certification it is hard to make sure if every challenge works correctly and can be completed. Thus it would be useful to add one ore both options.

[a2937]

So a bash script that updates the curriculum json location, generates the html test files, and opens the Playwright tests in the main freecodecamp project then?