Remove oci-hooks from QM

After pushing the hooks into QM, we realized (thanks to @alexlarsson) that the scripts were actually quite generic, and could be just moved to its own standalone project/library.

We are working on it at the moment. As soon as it is ready, and ideally after moving it to the `containers` namespace, we should remove the oci-hooks from the qm container and make the main package depend on the new hook project.

I will link the new repository here once we get there.