Update prepdata.sh

Appending files due to lapse in concentration.
Sorry @AndrewEichmann-NOAA

utils/test/prepdata.sh

@@ -4,5 +4,9 @@ set -e
 project_source_dir=$1
 
 ncgen -o rads_adt_j3_2021182.nc4 ${project_source_dir}/testdata/rads_adt_j3_2021182.cdl
+ncgen -o icec_amsr2_north_1.nc4 ${project_source_dir}/testdata/icec_amsr2_north_1.cdl
+ncgen -o icec_amsr2_north_2.nc4 ${project_source_dir}/testdata/icec_amsr2_north_2.cdl
+ncgen -o icec_amsr2_south_1.nc4 ${project_source_dir}/testdata/icec_amsr2_south_1.cdl
+ncgen -o icec_amsr2_south_2.nc4 ${project_source_dir}/testdata/icec_amsr2_south_2.cdl
 ncgen -o ghrsst_sst_mb_202107010000.cdl ${project_source_dir}/testdata/ghrsst_sst_mb_202107010000.cdl
-ncgen -o ghrsst_sst_mb_202107010100.cdl ${project_source_dir}/testdata/ghrsst_sst_mb_202107010100.cdl
+ncgen -o ghrsst_sst_mb_202107010100.cdl ${project_source_dir}/testdata/ghrsst_sst_mb_202107010100.cdl