JP-3156: Fix SOSS-specific spec_table unit labels

[tapastro]

Resolves JP-3156

Closes #

This PR addresses an inconsistency noted between PHOTMJ photom scalar conversion units and the unit labels in the spec_table output for NIRISS SOSS data. To keep the units consistent across exposure types, the correction applied here is to the labels, to consistently store spectral point-source data in units of MJy rather than Jy.

Checklist for maintainers

• 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
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10 🎉

Comparison is base (ad89ee0) 77.53% compared to head (37c1143) 77.63%.

❗ Current head 37c1143 differs from pull request most recent head d102b87. Consider uploading reports for the commit d102b87 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7538      +/-   ##
==========================================
+ Coverage   77.53%   77.63%   +0.10%     
==========================================
  Files         452      452              
  Lines       36200    36200              
==========================================
+ Hits        28066    28105      +39     
+ Misses       8134     8095      -39     

Flag	Coverage Δ
nightly	77.64% <100.00%> (+0.10%)	⬆️

Impacted Files	Coverage Δ
jwst/photom/photom.py	89.10% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[hbushouse]

Looks good. Should run a regtest, which we know will result in several expected differences. Are there any docs anywhere that mention units that might need updating? Oh, and change log needs a rebase.

[tapastro]

Regtest: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/643/

[hbushouse]

Regtest shows only expected differences. Looks good to me.