JP-1876: Add new Lvl2 association rule for NRSLAMPImage

[tapastro]

Resolves JP-1876
Resolves #5664

Added new association rule, modified regression test results for two association pools.

NOTE: This PR requires edits to the regtest truth files.

[codecov]

Codecov Report

Merging #5740 (9475a26) into master (c721119) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5740      +/-   ##
==========================================
+ Coverage   74.10%   74.13%   +0.03%     
==========================================
  Files         408      408              
  Lines       36844    36925      +81     
  Branches     4526     4526              
==========================================
+ Hits        27302    27376      +74     
- Misses       9542     9549       +7     

Flag	Coverage Δ		*Carryforward flag
nightly	75.68% <100.00%> (ø)		Carriedforward from c721119
unit	53.17% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
jwst/associations/lib/rules_level2b.py	94.73% <100.00%> (-1.65%)	⬇️

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