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Simplify frames used for ITkStrips

Nicholas Styles requested to merge nstyles/athena:master-simplifyFrames into master

Remove an extra coordinate transformation that was previously required to give expected positions for the ITkStrip. This is replaced by defining the mapping of x/y/z to eta/phi/depth in the necessary way in dedicated ITkStrip Digitization.

This also moves to using a hit coordinate definition consistent with the SCT for the ITkStrip G4 sensitive detector classes.

The removed transformation was the Identity for all cases aside from ITkStrip so should not have any impact beyond that.

FYI @hhayward

Edited by Nicholas Styles

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