Sweeping !56295 from master to 22.0. GaussianTrackDensity rm seeming unused (other than getting filled) std::map m_upperMap

Atlas Nightlybuildrequested to merge
cherry-pick-ef135763436-22.0 into 22.0

GaussianTrackDensity rm seeming unused (other than getting filled) std::map m_upperMap

See merge request !56295 (merged)

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