JP-1212: NIRSpec MOS spec3 regtest

[hbushouse]

Resolves #4403 and https://jira.stsci.edu/browse/JP-1212

calwebb_spec3 test on NIRSpec MOS data. Used 3-point dither pattern of simulated MOS images (for both detectors) and embedded the images in SDP files from jw00626 obs30. The MSA metadata file is chopped down to contain only 6 sources, 3 of which result in data on the NRS2 detector (all 6 have data on NRS1), with a mixture of point vs extended source designations and one dedicated background shutter (slitlet #8) thrown in for good measure. The 6 input _cal products result in 6 source-based results, each of which has a cal, crf, s2d, and x1d product. All 24 resulting products are tested.

Inputs and truth files have been uploaded to artifactory.

[codecov]

Codecov Report

Merging #4410 into master will decrease coverage by 11.27%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #4410       +/-   ##
===========================================
- Coverage   62.99%   51.72%   -11.28%     
===========================================
  Files         398      398               
  Lines       34522    34522               
  Branches     5337     5337               
===========================================
- Hits        21748    17857     -3891     
- Misses      11285    15573     +4288     
+ Partials     1489     1092      -397

Flag	Coverage Δ
#newnightly	?
#unit	51.72% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
jwst/rscd/rscd_sub.py	4.68% <0%> (-85.94%)	⬇️
jwst/coron/klip.py	14.63% <0%> (-82.93%)	⬇️
jwst/ami/ami_average.py	17.24% <0%> (-82.76%)	⬇️
jwst/wfs_combine/wfs_combine.py	13.87% <0%> (-80.87%)	⬇️
jwst/resample/resample.py	18.18% <0%> (-76.14%)	⬇️
jwst/coron/stack_refs.py	21.42% <0%> (-71.43%)	⬇️
jwst/wfs_combine/wfs_combine_step.py	30% <0%> (-70%)	⬇️
jwst/skymatch/skymatch.py	7.42% <0%> (-68%)	⬇️
jwst/pipeline/calwebb_tso3.py	18.18% <0%> (-66.24%)	⬇️
jwst/pipeline/calwebb_ami3.py	19.23% <0%> (-65.39%)	⬇️
... and 98 more

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