rename uncalibrated TopoCluster container CaloTopoCluster -> CaloTopoClusters (plural)

Walter Lamplrequested to merge
wlampl/athena:CaloTopoClusterS into master

Following discussion with @christos and @mhodgkin, renaming the transient container holding uncalibrated TopoClusters to 'CaloTopoClusters' (eg plural) as other EDM objects.

Since this touches many files, setting full-unit-tests

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