Merge branch 'revert_revert_of_MR_11_of_12' into '21.0'

Revert "Revert "Merge branch 'dropTrkTrackLinkFromAthSimulation_21.0' into '21.0'""

See merge request !5448

Projects/AthSimulation/package_filters.txt

@@ -350,7 +350,6 @@
 + Tracking/TrkEvent/TrkEventPrimitives
 + Tracking/TrkEvent/TrkNeutralParameters
 + Tracking/TrkEvent/TrkParametersBase
-+ Tracking/TrkEvent/TrkTrackLink
 
 
 # Ignore everything else