RCAL-801: update skymatch to return updated models if the input is an asn

[mairanteodoro]

Resolves RCAL-801

This PR ensures that SkyMatchStep always returns a ModelContainer with the updated datamodel.

I believe SkyMatchStep is due some refactoring (specifically regarding the intended use of memory management, as seen in JWST's SkyMatchStep), but I think that it should be done separately from the current PR.

Regression Tests

• https://plwishmaster.stsci.edu:8081/job/RT/job/Roman-Developers-Pull-Requests/721/

Checklist

• [ ] added entry in CHANGES.rst under the corresponding subsection
• [X] updated relevant tests
• [ ] updated relevant documentation
• [ ] updated relevant milestone(s)
• [X] added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.84%. Comparing base (1898ca5) to head (1e2cff6). Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1208 +/- ## ========================================== + Coverage 76.78% 76.84% +0.06% ========================================== Files 113 113 Lines 7933 7933 ========================================== + Hits 6091 6096 +5 + Misses 1842 1837 -5 ```

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