JP-1822: Update NRS fixed slit association rules for background eligibility

[tapastro]

Closes #5547

Resolves JP-1822

Description

This PR addresses the usage of science exposures as backgrounds for other science exposures in an observation with fixed slit nods; this is accomplished by using the SPAT_NUM keyword to match exposures with different spatial nod positions for use as backgrounds in each other's associations.

NOTE: Waiting for an up-to-date pool file for testing before merge.

Checklist

• Tests
• Documentation
• Change log
• Milestone
• Label(s)

[stscieisenhamer]

Obligatory "don't forget the changelog"

[tapastro]

Obligatory "don't forget the changelog"

I modified the jw00626 pool file to contain SPAT_NUM, and it runs successfully. However, the two unit tests with coverage of this edit are failing, so I think I may have a bit of maintenance to take care of first.

[hbushouse]

Updates to the actual ASN code look good. Of course unit tests need fixing now.

[codecov]

Codecov Report

Merging #5994 (ef24157) into master (6609329) will decrease coverage by 0.16%.
The diff coverage is 79.16%.

❗ Current head ef24157 differs from pull request most recent head 0134bba. Consider uploading reports for the commit 0134bba to get more accurate results

@@            Coverage Diff             @@
##           master    #5994      +/-   ##
==========================================
- Coverage   77.81%   77.65%   -0.17%     
==========================================
  Files         399      405       +6     
  Lines       35354    36726    +1372     
==========================================
+ Hits        27512    28519    +1007     
- Misses       7842     8207     +365     

Flag	Coverage Δ		*Carryforward flag
nightly	77.82% <64.70%> (ø)		Carriedforward from 6609329
unit	56.66% <63.63%> (-0.21%)	⬇️

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

Impacted Files	Coverage Δ
jwst/associations/lib/rules_level2_base.py	84.50% <79.16%> (-0.28%)	⬇️
jwst/pipeline/calwebb_spec2.py	76.74% <0.00%> (-19.32%)	⬇️
jwst/ramp_fitting/utils.py	92.40% <0.00%> (-1.85%)	⬇️
jwst/source_catalog/source_catalog_step.py	89.06% <0.00%> (-1.27%)	⬇️
jwst/step.py	100.00% <0.00%> (ø)
jwst/ramp_fitting/ramp_fit.py	100.00% <0.00%> (ø)
jwst/wfss_contam/__init__.py	100.00% <0.00%> (ø)
jwst/wfss_contam/wfss_contam.py	21.42% <0.00%> (ø)
jwst/wfss_contam/sens1d.py	25.92% <0.00%> (ø)
... and 6 more

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[stscieisenhamer]

obligatory "update changelog" but LGTM.