Migrate RectangularEtaPhiTrackingRegion to consumes()

RectangularEtaPhiTrackingRegion read MeasurementTrackerEvent with
getByLabel(). The solution is to move the responsibility of
consumes()+getByToken() to the classes constructing
RectangularEtaPhiTrackingRegion, and pass a pointer to
MeasurementTrackerEvent to RectangularEtaPhiTrackingRegion.