Fix maker utils to use correct units

[WilliamJamieson]

This PR properly resolves the units required by spacetelescope/rad#300 which resolves some inconsistencies between the two libraries.

Checklist

• Added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• updated relevant documentation
• Passed romancal regression testing on Jenkins / PLWishMaster. Link: https://plwishmaster.stsci.edu:8081/job/RT/job/romancal/XXX/

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (fdabf82) 96.68% compared to head (c80075e) 96.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #256   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files          29       29           
  Lines        2413     2413           
=======================================
  Hits         2333     2333           
  Misses         80       80           

Files Changed	Coverage Δ
src/roman_datamodels/maker_utils/_tagged_nodes.py	100.00% <100.00%> (ø)

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[PaulHuwe]

LGTM