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Add functionality to store subtracted cells in CPData mode

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

This adds a new decoration to charged FlowElements, only to be used in CPData mode (not used in production). The decoration is a list of ElementLink to CaloCell, along with a number representing a weight related to the charged shower subtraction.

This is achieved by augmenting the internal eflowRecTrack EDM with a vector of these pairs, which are then eventually propagated to the charged FlowElements.

Additional dictionary entries are added to xAODPFlow to allow these new decorations to be written to AOD/ESD.

This MR also removes a previous algorithm that attempted, unsuccessfully, to reconstruct these lists of CaloCells.

Tag @dnoll , @mswiatlo

Edited by Mark Hodgkinson

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