Rename to unambiguous pseudo- and geometric thickness and height names

[xylar]

Checklist

• Documentation:
  • User's Guide has been updated
  • Developer's Guide has been updated
  • Documentation has been built locally and changes look as expected
• Linting
  • Pre-commit run locally
• Building
  • CMake build does not produce any new warnings from changes in this PR
• Testing
  • Add a comment to the PR titled Testing with the following:
    • Which machines CTest unit tests
      have been run on and indicate that are all passing.
    • The Polaris omega_pr test suite
      has passed, using the Polaris e3sm_submodules/Omega baseline
    • Document machine(s), compiler(s), and the build path(s) used for -p for both the baseline (Polaris e3sm_submodules/Omega) and the PR build
    • Indicate "All tests passed" or document failing tests
    • Document testing used to verify the changes including any tests that are added/modified/impacted.
    • Performance related PRs: Please include a relevant PACE experiment link documenting performance before and after.

[xylar]

This whole document needs some updating but I don't want to distract from the purpose of this PR to do it.

[xylar]

Here and in the user's guide, there's a reference to LayerThicknessPStar, now PseudoThicknessPStar, but I didn't see this in the code itself.

[xylar]

Here and in the developer's guide, there's a reference to LayerThicknessPStar, now PseudoThicknessPStar, but I didn't see this in the code itself.

[xylar]

I feel pretty strongly that calling this the "Cartesian Z coordinate" is not correct -- the Cartesian coordinates for the MPAS mesh are in contrast to the spherical coordinates we usually use.

It also seems important to make clear that this is the geometric height (as opposed to the pseudo-height).

[xylar]

The other changes here are just to make the formatting consistent with the rest of the file.

[xylar]

Same as with ZInterface above.

[xylar]

I know this will make for a rebasing nightmare for work in progress so I'll wait on this until we can coordinate a good time for it. I'll suck up the rebasing nightmare here, because it's a pretty simple search-and-replace job.

[xylar]

This needs to be tested in tandem with E3SM-Project/polaris#440, which is very much a work in progress. But CTests are passing as long as I use new meshes that include the PseudoThickness variable.