Add deprecation warning on the Tracking Geometry svc init, will hopefully alert and make easier to catch clients

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:TrackingGeometrySvc_add_deprecation_warning_in_initialize into master

Add deprecation warning on the svc init, will hopefully alert and make easier to catch clients

Mentioning @sroe

Edited by Christos Anastopoulos

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