Merge branch 'TrkVertexSeedFinderUtils_fixes' into 'master'

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

See merge request !56295

(cherry picked from commit ef135763)

131813d7 GaussianTrackDensity rm seeming unused (other than getting filled) std::map m_upperMap
dc85e32b GaussianTrackDensity rm seeming unused (other than getting filled) std::map m_upperMap
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