Fix writing out and testing Concentration.

[ktbolt]

This fixes writing Concentration data and updates the CI test to check those results. #638.

[claude]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.11%. Comparing base (2148c18) to head (41bc0e3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #642      +/-   ##
==========================================
- Coverage   73.14%   73.11%   -0.04%     
==========================================
  Files         259      259              
  Lines       39516    39515       -1     
  Branches     6673     6674       +1     
==========================================
- Hits        28904    28891      -13     
- Misses      10368    10381      +13     
+ Partials      244      243       -1     

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[kko27]

Approved! I did have two comments.

1. Is there documentation for setting up simulations that involve scalar transport? I did not realize that there was a nuance of creating an Alias output type (to rename temperature as concentration).
2. Where does the reference solution for this test case come from?

[ktbolt]

@kko27 There is some basic documentation for the Precomputed_solution parameter but it does not really explain the scalar transport usage well enough. I think we will add a User Guide section for this.

The reference solution is from rerunning the simulation with the updated solver.xml file.