Use std::array of std::atomic instead of std::vector with std::mutex in MooCandidateMatchingTool.

Susumu Odarequested to merge
oda/athena:master-MuonTrackSteeringTools-v2 into master

This is followup of !25760 (merged)

RunTier0Tests.py was fine. RunTier0Tests.log

Edited by Susumu Oda

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