SCTOverlay : use DataPool

Merged Christos Anastopoulos requested to merge ATLAS-EGamma/athena:SCTOverlayUsePool into 23.0

SCTOverlay : use DataPool

This includes and should be reviewed after !62559 (merged)

The actual file changing is the SCT_Overlay

ping @jchapman and @tadej

Edited by Christos Anastopoulos

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