Rework Python Integration Tests to work with Go from inside the OCM core repository

[jakobmoellerdev]

What would you like to be added:

We want to have an integration test that is still able to function even when Spec Changes force us to touch up the test library. Additionally we do not want to spend efforts in maintaining language standards and test specification bindings for more than one language at this time. Thus we want to move all the integrations tests into the main repo, unify them under a single spec, and have them run the assertions within a Ginkgo suite.

Why is this needed:

https://github.com/open-component-model/ocm-integrationtest is currently hard to maintain because it contains bindings to a library thats no longer maintained. Thus we can currently not adjust it if we would introduce breaking changes or changes across versions.