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Fix Heavy Ion egamma reconstruction issues due to lack of UE subtraction

Qipeng Hu requested to merge qhu/athena:HeavyIonEgammaDev3 into master

Fix Heavy Ion egamma reconstruction issues due to lack of UE subtraction, and rerun CaloExtensionBuilder after HI egammaRec to avoid errors from InDetCaloClusterROISelector.

To fix egamma reconstruction, additional Getter classes for subtracted CaloCluster and EgammaTopoCluster are added, so the egammaRec can access topo clusters based subtracted cells. It's also possible to access topo clusters with and without UE subtraction thanks to SubtractedCaloClusterTopoGetter. Only CaloTopoCluster should be used as input for egammaRec at this time.

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