Switch BCM_DigitizationTool to use IAthRNGSvc

Merged John Derek Chapman requested to merge jchapman/athena:BCM_DigitizationMTRNG into master

In order for digitization output to be reproducible in AthenaMT the digitization code must be migrated to use the thread-safe random number service. Sub-system digitization code can be migrated one sub-system at a time. Decided to start with BCM as this is the simplest case. Local tests show that the digitization jobs run OK.

Edited by John Derek Chapman

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