test: typhoon-track back-end unit and integration tests

[jannisvisser]

Describe your changes

• I combined both PBIs / types of tests in this PR as I approached them together.
• See this devops task for explanation on what is tested how.
• Also in general see potential context in tasks.
• I changed 'beforeEach' to 'beforeAll' in all integration tests, which saves considerable time. Given that we already use 'removeEvents=true' in the mocking, we don't need to reset for every test. But in the future, always keep checking what makes sense.
• I duplicated all necessary dtos/enums now in a specific folder within tests/integration. Going forward if we need more and more of this, I'm still not convinced personally this is the best idea. But so be it for now.

Checklist before requesting a review

• I have performed a self-review of my code
• I have added tests wherever relevant
• I have made sure that all automated checks pass before requesting a review