RCAL-911 & 932: remove units from MOS and ELP pipelines.

[mairanteodoro]

Resolves RCAL-911
Resolves RCAL-932

This PR modifies several files so that units are not used anymore. Additionally, the filename used in the regression tests was changed to remove the ggsaa component.

The information about units is still retained in the RAD schema.

Tasks

• request a review from someone specific, to avoid making the maintainers review every PR
• add a build milestone, i.e. 24Q4_B15 (use the latest build if not sure)
• Does this PR change user-facing code / API? (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)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

news fragment change types...

• changes/405.general.rst: Remove units from roman_datamodels.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.77%. Comparing base (087a60d) to head (6cfe09a).
Report is 56 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   97.56%   97.77%   +0.21%     
==========================================
  Files          30       37       +7     
  Lines        2788     3456     +668     
==========================================
+ Hits         2720     3379     +659     
- Misses         68       77       +9     

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[schlafly]

This all looks good to me, thanks!