Use DAG manner of expressing relations between jobs

Daniel Hugo Campora Perezrequested to merge
dcampora_better_ci into master

This MR uses a DAG (Direct Acyclic Graph) to express the relations between jobs.

Built on top of !464 (merged). Relevant diff: https://gitlab.cern.ch/lhcb/Allen/-/compare/dcampora_contracts...dcampora_better_ci

Edited by Daniel Hugo Campora Perez

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