InDetGeometryValidation+InDetFullChainTests: delete obsolete RTT testing packages

Frank Winklmeierrequested to merge
fwinkl/athena:indet_rtt into master

Delete two obsolete RTT testing packages:

  • InDetGeometryValidation
  • InDetFullChainTests

Also delete RTT/ATN-related files from InDetRecExample and InDetPhysValMonitoring.

cc @stsuno @sroe

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