Migrate CscOverlay to use the thread-safe random number service

John Derek Chapmanrequested to merge
jchapman/athena:CscOverlay_IAtRNGSvc_master into master

This merge request migrates the CscOverlay Algorithm to use the thread-safe random number service via the IAtRNGSvc interface. This change will alter the CscOverlay output due to different random number seeding.

Edited by John Derek Chapman

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