JP-3678: Ensure C extension works with multiprocessing

[kmacdonald-stsci]

Resolves JP-3678

Closes #8618

This PR addresses an error in multiprocessing with the selection of the OLS_C algorithm. The C extension flag was not properly passed to the sliced data when prepared for multiprocessing, so the old python code ran, even the the C extension was selected. The C extension selection is now properly passed to the sliced data, so the C extension will be run when multiprocessing is selected.

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 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.76%. Comparing base (5772579) to head (8c92688).
Report is 180 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stcal/ramp_fitting/ols_fit.py	57.14%	3 Missing ⚠️
src/stcal/ramp_fitting/ramp_fit.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   83.79%   83.76%   -0.03%     
==========================================
  Files          35       35              
  Lines        6998     7004       +6     
==========================================
+ Hits         5864     5867       +3     
- Misses       1134     1137       +3     

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[kmacdonald-stsci]

Running a regression test:

https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1576/

[drlaw1558]

LG2M- confirmed based on runtime that it's now using the C algorithm when it's meant to, even with multiprocessing on.

[melanieclarke]

Just a few suggestions for the new log messages. Otherwise, looks good!

[melanieclarke]

Suggested change

	log.info("Returning from C extension")
	log.debug("Returning from C extension")

[melanieclarke]

Looks good to me now. Thanks!

[melanieclarke]

I forgot to mention - I looked at the regression tests that failed and they are unrelated. These three tests seem to intermittently fail fairly often (test_nirspec_missing_msa_fail, test_nirspec_missing_msa_nofail, and test_duplicate_names).

[nden]

I started another test run - the previous one did not pick up the correct commit and did not test the changes in this PR.
https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1579/

Failures are unrelated.