Replace no longer working class "workshop" by a new parameter for the accounts class

[cmd-ntrf]

This PR proposes to deploy the archives that should be part of a workshop in /etc/skel. The uncompress archives will be copied automatically to new user home folders when they are created.

The archive source and filename must be specified in hieradata like this:

profile::accounts::skel_archives:
  - filename: cq-intro-python-gpu.zip
    source: https://codeload.github.com/calculquebec/cq-intro-python-gpu/zip/refs/heads/main
  - filename: intro-programmation-python.zip
    source: https://github.com/calculquebec/intro-programmation-python/archive/refs/heads/main.zip
  - filename: magic_castle-ovh-11.8.tar.gz
    source: https://github.com/ComputeCanada/magic_castle/releases/download/11.8/magic_castle-ovh-11.8.tar.gz