Updates to chgres_cube from integration with SRW

[WeirAE]

Synopsis

A set of changes to the drivers run as part of SRW's make_ics/make_lbcs task.

Minor changes to the UW YAML to remove additional properties and add one type
Reference configs reorganized to reflect expected make_ics namelist
Logic changes for file path handling in chgres_cube to account for strict key path references

Currently failing test coverage due to changes.

Type

• Bug fix (corrects a known issue)
• Code maintenance (refactoring, etc. without behavior change)
• Documentation
• Enhancement (adds new functionality)
• Tooling (CI, code-quality, packaging, revision-control, etc.)

Impact

• This is a breaking change (changes existing functionality)
• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.

[christinaholtNOAA]

I didn't review all of the code, just the logic for the namelist checks.

[WeirAE]

So, Python 3.13 just dropped and it depreciates imghdr, which is used in older versions of sphinx. Currently we're requiring sphinx_rtd_theme=2.0.* and sphinxcontrib-bibtex=2.6.*. Current versions are 3.0 and 2.6.3, respectively. I think the fix is to bump to sphinx_rtd_theme=3.0.* because sphinx didn't fix it until the latest version

[WeirAE]

I was holding for another possible fix, but I think that can be added later - thanks for the help