Implement shared edition and shared labs

Summary

Currenlty labarcore has a notion of shared editions and shared labs/sessions. This must also be implemented in the queue front-end pages. todo:

• Allow teachers to create a shared edition.
• Allow teachers to create a shared session in the shared edition.
  Shared editions must be shown instead of an edition if the edition is in a shared edition.
  Shared labs must be shown instead of individual labs if they exists.

Reasoning