End-to-end tests for Liima

[mburri]

I analyzed the existing implementation for deployments affecting #353. I quickly realized that there would be a huge potential for refactorings, but often the test coverage is not sufficient to support efficient refactorings.

Writing new unit tests would be possible, but is often quite difficult due to the number of dependent services, repositories
and boundaries that must be mocked away. In addition, mocking all these dependencies actually makes it harder to refactor, since the mocks couple the test to the actual implementation.

Anyway. Having end-to-end tests that cover the main paths of the application would be helpful. There was an e2e test setup in the AMW_angular module. But:

• no tests have ever been written
• Protractor is deprecated as of September 2023: https://blog.angular.io/protractor-deprecation-update-august-2023-2beac7402ce0#:~:text=At%20the%20end%20of%20this,change%20in%20August%20of%202022.

So I removed Protractor from the AMW_angular module.

Then I decided to create a separate module for the end-to-end testing, because the whole application is affected, not just the parts implemented in Angular.

For now, this is just the setup with a very simple test to show, that the setup is correct.

This PR adds a dedicated Github Action Workflow to run the end-to-end tests. But there are lots of overlappings with the existing build and test action. The e2e tests could also be added to the existing workflow.

Please feel free to suggest changes, improvements or even reject this PR

[yvespp]

Im fine with integrating it into the existing workflow, I think we want to run it always anyway.
I'm not familiar with cypress but it looks good. We can also use it to test REST APIs that aren't used by Angular.