JP-3593: 2nd group saturation part 2

[drlaw1558]

Ready for review: this addresses JP-3593, flagging cosmic ray saturation in group 2 data in a consistent manner between both IRS2 and non-IRS2 modes using the new use_readpatt keyword. This PR is tied to JWST PR spacetelescope/jwst#8731

Checklist

• added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.74%. Comparing base (375f310) to head (3b924fb).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #283      +/-   ##
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+ Coverage   84.69%   84.74%   +0.04%     
==========================================
  Files          44       44              
  Lines        8501     8527      +26     
==========================================
+ Hits         7200     7226      +26     
  Misses       1301     1301              

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[drlaw1558]

@tapastro Should now be ready for review.

[schlafly]

Thanks, this looks like a good algorithm to me. Thank you for making it handle ~arbitrary read patterns!

[tapastro]

Running a set of regression tests on the PR pair here: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1722/