JP-1863: Correct offset in cross-dispersion axis for NIRISS WFSS extraction boxes

[tapastro]

Resolves JP-1863
Resolves #5640

This changes the center of the extraction bounding box from:
- an average in grism pixel space
to:
- the sky position, transformed to the grism pixel space.

This has not fixed all offset issues, but my best guess in location of the remaining error would be in some combination of source astrometry and transform polynomials. Would like feedback from INS team.

[codecov]

Codecov Report

Merging #5809 (dd7d324) into master (f8d9122) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #5809      +/-   ##
==========================================
- Coverage   76.49%   76.45%   -0.05%     
==========================================
  Files         406      406              
  Lines       36248    37445    +1197     
==========================================
+ Hits        27728    28628     +900     
- Misses       8520     8817     +297     

Flag	Coverage Δ		*Carryforward flag
nightly	76.49% <50.00%> (ø)		Carriedforward from f8d9122
unit	54.50% <50.00%> (-0.13%)	⬇️

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/assign_wcs/util.py	80.00% <50.00%> (+1.11%)	⬆️
jwst/cube_build/cube_overlap.py	83.21% <0.00%> (-10.96%)	⬇️
jwst/skymatch/region.py	74.42% <0.00%> (-6.15%)	⬇️
jwst/ami/utils.py	73.48% <0.00%> (-4.78%)	⬇️
jwst/resample/resample.py	92.30% <0.00%> (-3.89%)	⬇️
jwst/rscd/rscd_sub.py	41.54% <0.00%> (-3.58%)	⬇️
jwst/ami/analyticnrm2.py	82.83% <0.00%> (-2.62%)	⬇️
jwst/associations/lib/rules_level2b.py	94.59% <0.00%> (-1.92%)	⬇️
jwst/ramp_fitting/create_cube.py	6.48% <0.00%> (-1.85%)	⬇️
jwst/associations/lib/rules_level3.py	97.53% <0.00%> (-1.71%)	⬇️
... and 5 more

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