(DO NOT MERGE) test HLLD solver with hydro tests

[BenWibking]

Description

Please write a short paragraph describing what changes this pull request makes to the code. It should provide sufficient context so that a reviewer can efficiently browse the source code changes.

Related issues

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Checklist

Before this pull request can be reviewed, all of these tasks should be completed. Denote completed tasks with an x inside the square brackets [ ] in the Markdown source below:

• I have added a description (see above).
• I have added a link to any related issues see (see above).
• I have read the Contributing Guide.
• I have added tests for any new physics that this PR adds to the code.
• I have tested this PR on my local computer and all tests pass.
• I have manually triggered the GPU tests with the magic comment /azp run.
• I have requested a reviewer for this PR.