Derivations CI tests modernisation
This MR moves derivations CI tests to be fully ComponentAccumulator based and for now runs on fixed AOD inputs for sufficient statistics. Currently 100 events with 4 processes, but tweaking the I/O settings would allow us to run ~100 events per process (will come later).
All 8 added tests take ~3 minutes in parallel. Given that this replaces existing tests that were run after reco, the overall CI time should not be affected noticeably.