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Remove use of highThreshold bit in PrDebugUTTruthTool

Michel De Cian requested to merge decianm-removeHighThresHitPrDebugUTTruthTool into master

Remove use of highThreshold bit in PrDebugUTTruthTool (to prepare for removal of the member in UTHit). The discrimination power of the highThreshold bit in terms of good tracks vs fake tracks is very small (on simulation) (in VeloUT there was no change in 100 events, in PrLongLivedTracking it was < 1%, but there it is an input to a NN), but a removal would make the UTHits slimmer, which could speed up the sequence. If it turns out to be very different in newer simulation, it can easily be reintroduced again.

Edited by Marco Cattaneo

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