Missing 2m height coordinate and monotonicity for tasmin in CESM2 and CESM2-WACCM

[Karen-A-Garcia]

This is a follow up to issue #2573 for the height coordinates. Still looking into the time issue. There was already a fix for the 2m height previously done for tas and I simply applied the fix to tasmin in both CESM2 and CESM2-WACCM files. There were already tests written for the fixes so I didn't add anything to those files.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.65%. Comparing base (c792a52) to head (41f6562). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2574 +/- ## ========================================== - Coverage 94.66% 94.65% -0.01% ========================================== Files 251 251 Lines 14286 14288 +2 ========================================== + Hits 13524 13525 +1 - Misses 762 763 +1 ```

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[Karen-A-Garcia]

Thanks @valeriupredoi and thanks for showing me a similar fix for the monotonicity too. I've added a fix for the monotonicity as well as adding tests for them and I ran pre-commit before sending pushing the changes. Let me know if there's anything else I need to change.