Ice-shelf diagnostics

[alex-huth]

New diagnostics for ice-shelf flux divergence, strain-rates, deviatoric stresses, speed, surface slope magnitude, and driving stress magnitude. Fixed some misleading units for variables related to ice viscosity

[Hallberg-NOAA]

These added diagnostics and corrected comments seem valuable, but this PR uses potentially dangerous array syntax calculations. Such array syntax calculations are strongly discouraged in MOM6, as discussed at https://github.com/NOAA-GFDL/MOM6/wiki/Code-style-guide#array-syntax . Please revise this PR to avoid the use of explicit array syntax math or implied array syntax math in the arguments to the post_data calls.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.88%. Comparing base (ba59078) to head (b0aadcb).
Report is 10 commits behind head on dev/gfdl.

Additional details and impacted files

@@             Coverage Diff              @@
##           dev/gfdl     #728      +/-   ##
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+ Coverage     36.67%   40.88%   +4.21%     
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  Files           274       42     -232     
  Lines         83858     5288   -78570     
  Branches      15761     1013   -14748     
============================================
- Hits          30754     2162   -28592     
+ Misses        47326     2941   -44385     
+ Partials       5778      185    -5593     

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[Hallberg-NOAA]

These changes now look correct to me.

[marshallward]

Gaea regression: CM4_piControl_c192_OM4p25_bench ✔️