JP-3583: Long integrations truncation in ramp fitting

[mwregan2]

Resolves JP-3583

Closes spacetelescope/jwst#8373

This PR addresses an issue in the ramp_fitting routine where when finding the cosmic ray free segments of integrations. The code accumulates the non-CR groups using a counter. The problem is that this counter is a uint8 data type. Thus, once we get above 256 groups, it rolls over leading to only using a subset of the groups in the slope fit.

The solution was to change three variables from UINT8 to UINT16. This is big enough given the overall limit on the number of frames.

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

Attention: Patch coverage is 82.97872% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 85.18%. Comparing base (41259f3) to head (f618519).
Report is 9 commits behind head on main.

Files	Patch %	Lines
tests/test_ramp_fitting.py	81.81%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   85.90%   85.18%   -0.73%     
==========================================
  Files          35       35              
  Lines        6557     6797     +240     
==========================================
+ Hits         5633     5790     +157     
- Misses        924     1007      +83     

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