move refs under allOfs where required

[braingram]

Including a $ref key in a schema mapping/object/dict comes with the requirement that other members of that mapping are ignored. See https://datatracker.ietf.org/doc/html/draft-pbryan-zyp-json-ref-03#section-3

This PR updates the RAD schemas nesting $refs in allOf combiners when the mapping contains other items and adds a test to verify the changes.

Romancal regtests all pass: https://github.com/spacetelescope/RegressionTests/actions/runs/12260132209

Tasks

• Update or add relevant rad tests.
• Update relevant docstrings and / or docs/ page.
• Does this PR change any schema files?
  • Schema changes were discussed at RAD Review Board meeting.
• Does this PR change any API used downstream? (If not, label with no-changelog-entry-needed.)
  • Write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types).
  • Start a romancal regression test (https://github.com/spacetelescope/RegressionTests/actions/workflows/romancal.yml) with this branch installed ("git+https://github.com/<fork>/rad@<branch>").
  • Update relevant roman_datamodels utilities and tests.

News fragment change types:

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.removal.rst: deprecation or removal of public API
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.41%. Comparing base (a60eed1) to head (0fd380a).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #525      +/-   ##
==========================================
+ Coverage   96.24%   96.41%   +0.16%     
==========================================
  Files           4        4              
  Lines         213      223      +10     
==========================================
+ Hits          205      215      +10     
  Misses          8        8              

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[schlafly]

Okay, thanks Brett. I'm not a maintainer but I'm happy to approve a bug fix that passes regtests. This does also highlight that we don't have any tvac / fps tests in the current regtests; perhaps @stscieisenhamer can add one of those as part of his TVAC translation tests.