Draft: Use tar instead of zip for archiving artifacts

This MR addresses the comment about moving from zip to tar.

Related things to do:

• remove zip from the artifact name: https://gitlab.cern.ch/lhcb-core/nightly-builds/lb-nightly-configuration/-/blob/master/lb/nightly/configuration/project.py#L632-700 (lb-nightly-configuration!44)
  • and then adapt the test: https://gitlab.cern.ch/lhcb-core/nightly-builds/lb-nightly-scheduler/-/blob/master/tests/test_trigger_deployment.py (lb-nightly-scheduler!52)
• adapt the function to create slot deployment directory artifact: https://gitlab.cern.ch/lhcb-core/nightly-builds/lb-nightly-utils/-/blob/master/lb/nightly/utils/_deployment_helpers.py#L35-65
• adapt lbtask to use tar archives directly: https://gitlab.cern.ch/lhcb-core/tasks/lbtaskrun/-/blob/master/src/lbtaskrun/cvmfs/new_nightlies.py