Fix extrapolators in DD4HEP builds
The following discussion from !3510 (merged) should be addressed:
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@jonrob started a discussion: (+6 comments) Extrapolators
UpdateManagerSv... ERROR Cannot retrieve Conditions/Online/LHCb/Magnet/Measured from data provider! ServiceManager ERROR Unable to initialize service "MagneticFieldSvc" ExtrapolatorTes... ERROR ServiceLocatorHelper::service: can not locate service MagneticFieldSvc
basically the same issue as with RICH task.