Remove units from MOS pipeline.

[mairanteodoro]

Resolves RCAL-911

Closes #

This PR addresses ...

Tasks

• update or add relevant tests
• update relevant docstrings and / or docs/ page
• 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 with this branch installed ("git+https://github.com/<fork>/roman_datamodels@<branch>")

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 92.74%. Comparing base (087a60d) to head (211d3a4).
Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #399      +/-   ##
==========================================
- Coverage   97.56%   92.74%   -4.82%     
==========================================
  Files          30       36       +6     
  Lines        2788     3364     +576     
==========================================
+ Hits         2720     3120     +400     
- Misses         68      244     +176     

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[schlafly]

This looks good to me. Let's not merge yet but I don't see any issues.