remove private asdf api usage

[braingram]

Removes private asdf API usage introduced in #721

Replacing asdf.schema._safe_resolve with public API urldefrag(resolve_uri(...)).

I also added another acceptable remote to the archive.py script which was needed to allow me to test these changes locally.

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 89.14%. Comparing base (58eb8dd) to head (a465cab).
⚠️ Report is 118 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #742      +/-   ##
==========================================
- Coverage   97.76%   89.14%   -8.62%     
==========================================
  Files           8       14       +6     
  Lines         759     1013     +254     
==========================================
+ Hits          742      903     +161     
- Misses         17      110      +93     

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[braingram]

@PaulHuwe @WilliamJamieson I'd like to get this in before the release so that version isn't using private API.

[PaulHuwe]

LGTM