Add a versioning system to allow running an old version of the test

Hey there,

To integrate Bugbug into my CI/CD and have my tests pass on multiple environments, I currently have to duplicate the tests and modify the changed parts, which is inefficient...

It would be great if we could have test versioning so that I could point the production-oriented test to the production environment (let's name it v1.0) and the development-oriented test (v1.1) to my development environment.

With that, when I deploy dev to prod, I'll be able to point the test I've already created for dev (v1.1) directly to production.

Without that, I'll have to spend time modifying the tests right after deploying dev to production, otherwise the tests would fail.