[PWGEM] add new deduplication modes + MC information - #17407
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Two new deduplication modes added:
Deduplaction Mode 2: Instead of ranking V0 candidates by score and accepting them one by one, as the greedy mode does, the whole group of candidates connected through shared tracks is decided at once, keeping the maximum number of V0s that do not share a track. Among equally large solutions the one with the smallest sum of scores wins, so the score still decides, but only between solutions of the same size.
Dedpulication Mode 3: Keeps all V0s. No deduplication - more for cross-checks.
For better diagnostics of the deduplication procedure truth categories where added. processMC now classifies every candidate from the MC mothers of its two legs: true (both legs from the same photon), cross-leg fake (legs from two different photons), other fake (at least one leg is not a conversion leg) — and records which surviving candidate took a leg from a rejected one. A true photon counts as lost when all of its true candidates were rejected, and those blockers give the reason.