Fix thread-safety warnings in MuonTGRecTools
requested to merge atsirigo/athena:Fix-thread-safety-warnings-in-MuonTGRecTools-ATLASRECTS-5308 into master
Fix thread-safety warnings in MuonSpectrometer/MuonReconstruction/MuonRecTools/MuonTGRecTools: ATLASRECTS-5308 Removed unused mutables, changed the used mutable variables to be thread safe, deleted commented out code, made tools private, and removed the MuonTGHitNtuple that was very thread unsafe and was not used any more.
Closes ATLASRECTS-5308