Fix InternalEnergyFromDensityPressure for JWL for some states

[Yurlungur]

PR Summary

A user discovered that the InternalEnergyFromDensityPressure call was failing to produce the correct internal energy for some EOS calls for JWL. The problem in question was a shock tube described in this paper. The issue it turns out was that singularity-eos generically uses a root find for this call and it picks the bounds for the root find based on the max and min temperature. But JWL is not a thermodynamically consistent EOS and the result was that the lower bound is below the reference temperature curve.

In this case, the fix is easy: simply replace the root find with the analytic solution, since JWL has an analytically invertable sie(rho, P). I implement the fix and add tests to JWL to check that it's functioning properly.

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the make format command after configuring with cmake.
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• After creating a pull request, note it in the CHANGELOG.md file.
• LANL employees: make sure tests pass both on the github CI and on the Darwin CI
• If ML was used, make sure to add a disclaimer at the top of a file indicating ML was used to assist in generating the file.
• If Agentic AI was used, have the AI generate a "proposed changes" markdown file and store it in the plan_histories folder, with a filename the same as the MR number.

If preparing for a new release, in addition please check the following:

• Update the version in cmake.
• Move the changes in the CHANGELOG.md file under a new header for the new release, and reset the categories.
• Maintainers: ensure spackages are up to date:
  • LANL-internal team, update XCAP spackages
  • Current maintainer of upstream spackages, submit MR to spack

[Yurlungur]

Thanks @chadmeyer for your help figuring this out

[Yurlungur]

Tests passing on darwin. Pulling the trigger.