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Split PFlow Weights Up

Mark Hodgkinson requested to merge atlas-particleflow-software/athena:mhodgkin_splitWeights into main

Currently WeightPFOTool returns one weight that is applied to FlowElements prior to jet finding. This weight consists of a part related to double counting of energy in the ID and calorimeter in eflowRec and one part related to smoothing out the uncalibrated jet energy scale.

This MR splits access to the weight into two parts which gives a clear separation between weights relevant at the individual FlowElement level and at the jet level.

No changes in output were expected. This was seen to be the case running diff-root on 500 WPrime events.

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