Add mutex or atomic to mutable data members of SCT classes (ATLASRECTS-4557, ATLASSIM-3931)

Susumu Odarequested to merge
oda/athena:master-SCT-mutable into master

Add mutex or atomic to mutable data members of SCT classes.

RunTier0Tests.py was fine. RunTier0Tests.log (Memory leak increase was also seen in MR !21017 (merged))

Edited by Susumu Oda

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