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Master min pT for TRT PID NN calculation

Christian Grefe requested to merge cgrefe/athena:master-TRT-PID-RNN-minPt into master

This MR addresses the CPU issues introduced by the addition of the TRT PID NN by requiring a minimum track pT. The default is set to 2 GeV which removes the vast majority of calls to the NN evaluation and should still cover all tracks used for physics. In addition, an InDetFlag has been introduced to disable the NN calculation (and DB access) completely.

See ATLASRECTS-5749 for the CPU performance discussion.

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