Run e2e tests in parallel

[BioPhoton]

As we access the same folder for all tests we get interference between tests.

The solution here is to create a test setup and folder for every Project Instance.

• [ ] Create the package.json dynamically => needed for serveCommand CLI param which executes a npm srcipt
• [ ] Add time stamp to the project folder

[ChristopherPHolder]

Running test in parrallel is still not working:

This MR reverted to sequential e2e test

https://github.com/push-based/user-flow/pull/268

[ChristopherPHolder]

Currently all test including e2e take 2 min in the pipeline. This issue should not be prioritised.