Organise H4RG defects by logical serial number (snX) not spectrograph number (nY)

The mapping of H4RG device to final spectrograph is not yet known, and indeed the mapping is different at JHU and LAM.  Accordingly, we added sn names for the chips as follows:

The defects need to be arranged by sn number, not spectrograph number.  In order for this to be useful, the script that ingests them to be used in a calibration directory needs to be a little smarter:

• copy $DRP_PFS_DATA_DIR/curated/pfs/defects/snX to StagingDirectory/nY with the mapping depending on the site
• patch the header in the defects .ecsv files to map to the correct detector
• Run ingestCuratedCalibs.py $TARGET --calib $TARGET/CALIB StagingDirectory --config clobber=True

While working on this ticket, we should add the serial to the metadata in the defects .ecsv files