Add a simple test of combinations using the v2 particle model

Miguel Ramos Pernasrequested to merge
mramospe-fix-particle-combination into master

Add test to verify that we can do combinations of particles built using the v2 particle event model.

Related to LHCb!3378 (merged) and Rec!2689 (merged)

Edited by Miguel Ramos Pernas

Merge request reports