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MuonReadoutGeometryR4: Speed up MdtTubeLayer::getTubeNode().

Scott Snyder requested to merge ssnyder/athena:getTubeNodeSpeedup.MuonReadoutGeometryR4-20240510 into main

This was using getChildVol. However, that keeps track of the transform to each child, even though that is not actually used. This is slow, especially in debug builds where Eigen operations tend to be expensive.

Instead, use GeoVisitVolumes to iterate over children without calculating the transforms.

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