Add units to the descriptions of 115 variables

[Hallberg-NOAA]

Added or corrected the units in comments describing about 115 real variables scattered across 14 tracer modules and 10 other modules. All answers are bitwise identical, and only comments are changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.11%. Comparing base (43b2a43) to head (731e02b).

❗ Current head 731e02b differs from pull request most recent head 3b3ea46. Consider uploading reports for the commit 3b3ea46 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           dev/gfdl     #586      +/-   ##
============================================
+ Coverage     37.07%   37.11%   +0.03%     
============================================
  Files           271      271              
  Lines         80968    80841     -127     
  Branches      15118    15096      -22     
============================================
- Hits          30021    30005      -16     
+ Misses        45324    45225      -99     
+ Partials       5623     5611      -12     

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[marshallward]

I didn't verify every unit in situ, but they all seem reasonable.

Someday, we might want to distinguish between real time (CPU time) and model time,

[marshallward]

@Hallberg-NOAA There is a minor conflict here after the merge from main.

[marshallward]

Gaea regression: https://gitlab.gfdl.noaa.gov/ogrp/MOM6/-/pipelines/23098 ✔️