update inDetector method for handling ITkStrip sensors with mutliple SiDetectorElements per module

As above; porting changes from 21.9 merge request !42739 (merged)

Updates for inDetector checks, to allow geometries with split rows to do this check based on their motherDesign, and thus avoid returning an outside status more often than intended (i.e. when at edge of row, but not at edge of sensor).

FYI @hhayward @ncalace @tstreble