JP-2071: Add feature to turn off calculations for saturated ramps with good 0th group

[kmacdonald-stsci]

Resolves JP-2071

A suppress_one_group boolean variable has been added as a parameter to the ramp_fit function.

When true saturated ramps with only the 0th group being good will be treated as completely saturated ramps. The calculations will be done as if all calculations are saturated, but the DQ flags will be set as if the first group is good, i.e., the pixel DQ will not have DO_NOT_USE set.

When false saturated ramps with only the 0th group being good will be treated as the normal special case of having only one good group.

[codecov]

Codecov Report

Merging #76 (9b4904f) into main (47aec18) will increase coverage by 0.09%.
The diff coverage is 97.14%.

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   88.63%   88.73%   +0.09%     
==========================================
  Files          16       16              
  Lines        2262     2290      +28     
==========================================
+ Hits         2005     2032      +27     
- Misses        257      258       +1     

Impacted Files	Coverage Δ
src/stcal/ramp_fitting/gls_fit.py	63.36% <ø> (ø)
src/stcal/ramp_fitting/ramp_fit.py	95.00% <96.55%> (+0.88%)	⬆️
src/stcal/ramp_fitting/ols_fit.py	93.77% <100.00%> (ø)
src/stcal/ramp_fitting/ramp_fit_class.py	100.00% <100.00%> (ø)
src/stcal/ramp_fitting/utils.py	98.47% <100.00%> (ø)

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[hbushouse]

LGTM

[hbushouse]

We need reviews and approvals from either @dmggh or @nden

[dmggh]

Looks good to me.