JP-3642: Fix aperture correction to variance arrays

[ianyuwong]

Resolves JP-3642

Closes #8521

This PR fixes an error in the application of aperture correction factors to variance arrays in extract1d/apply_apcorr.py. New code splits the columns to which aperture correction is applied into the flux columns (flux_cols_to_correct) and the corresponding variance arrays (var_cols_to_correct). For the latter, it multiplies the square of the correction factor to the variance arrays.

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• All comments are resolved
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 58.02%. Comparing base (4179c09) to head (39fb3db).
Report is 321 commits behind head on master.

Files with missing lines	Patch %	Lines
jwst/extract_1d/apply_apcorr.py	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8530      +/-   ##
==========================================
+ Coverage   57.97%   58.02%   +0.04%     
==========================================
  Files         387      388       +1     
  Lines       38830    38979     +149     
==========================================
+ Hits        22513    22618     +105     
- Misses      16317    16361      +44     

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[hbushouse]

Regression tests started at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1500

[hbushouse]

Code updates look good. Will wait for regtest results for final approval.

[hbushouse]

Regression test results show the expected increases in the variance columns of x1d/x1dints files, along with some other unrelated differences. So this looks good.