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.
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/485.removal.rst: Remove units from rad schema.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.81%. Comparing base (810c17f) to head (267d9e1).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #485   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files           4        4           
  Lines         215      215           
=======================================
  Hits          206      206           
  Misses          9        9           

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[schlafly]

Looks good to me, only a few minor unit doc suggestions.