Fix integration test generator script and makefile command

[petechd]

What is the context of this PR?

This adds integration test generator script and makefile changes that we've discussed. Chromium can no longer be downloaded and installed on the latest operating systems for security reasons (it will result in an error when using the makefile command). We need to use Chrome browser as a default and skip the download and install step in Makefile, since Chrome is based on Chromium anyway, we can use it by setting channel parameter. For more info check the docs.

How to review

Check the changes and the behaviour before (you need one of the newer versions of your operating system).

Checklist

• New static content marked up for translation
• Newly defined schema content included in eq-translations repo

[VirajP1002]

All your changes work well 👍

Just a separate minor point (which may be something considered in the past) is when I ran the script for the schema test_checkbox, the test generated was called test_test_checkbox and the same goes for the class name with 2 tests as part of the name, is that something we want to consider avoiding?