WIP: Temp test with LCG95

Dmitry Popovrequested to merge
dpopov/Gauss:switch_Sim10_to_LCG95 into master

This is a temporary MR to test Gauss in lhcb-sim10 with LCG 95 by forcing it to switch to LHCb v50r4 and G4 vSim10.

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