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[ATR-21215] Combo hypo: check prior features

Tim Martin requested to merge tamartin/athena:combo_hypo_check_prior into master

For ATR-21215

Adds an additional uniqueness criteria to the combo hypo.

Tow features, A5 and A2, are considered similar/non-unique if one feature is an earlier version of another, i.e. if the stepwise reconstruction went A1->A2->A3->A4->A5

This is needed to properly count multiplicities in tag-and-probe chains, during the probe steps we are always comparing final-step features on the tag- leg with intermediate-step features on the probe- leg.

The removing of duplicates is then left to the existing de-dupe algorithm.

Changes to HLT_e24_lhmedium_g25_medium_L12EM20VH reflect that in Step4 additional rejection of photons-which-are-also-electrons is possible here.

Edited by Tim Martin

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