Github Action script to run preview_namelists

[mnlevy1981]

Description of changes

Adds Github Action to create cases using a range of compsets (currently B, C, C with MARBL, D, I, Q, and T) and run preview_namelists. I intentionally set up the matrix to turn this into 35 parallel jobs (7 compsets and 5 versions of python)... it might be more efficient to have a separate job for each version of python that creates all 7 compsets in that same job, but I think that would make it harder to parse the results. If a B compset is failing because of issues in MOM6, CAM, and CLM, then we should see failures in B, both Cs, I, and Q tests while a single job per python version would just abort after the first failure and not catch the other four.

Specific notes

Contributors other than yourself, if any: @manishvenu was helpful in getting past some issues I had with github actions

Fixes: [Github issue #s] And brief description of each issue.

User interface changes?: [ No/Yes ]
[ If yes, describe what changed, and steps taken to ensure backward compatibility ]

Testing performed (automated tests and/or manual tests): These tests have run on my branch at https://github.com/mnlevy1981/cesm/actions/runs/11946703920 -- note that I had 3.14 in the python version matrix, but those tests failed with

Version 3.14 was not found in the local cache
  Error: The version '3.14' with architecture 'x64' was not found for Ubuntu 22.04.

So I removed it from this PR. Test results:

• Fails in python 3.9 for G and B compsets because CICE's buildnml relies on glob.glob API introduced in 3.10
• Fails all 3.12 and 3.13 tests because distutils has been removed from the standard library

[jedwards4b]

@mnlevy1981 I believe that if you update to the latest cime it should fix the distutils issue.

[jedwards4b]

should be actions/setup-python@v5

[mnlevy1981]

done in c9eb302

[mnlevy1981]

@mnlevy1981 I believe that if you update to the latest cime it should fix the distutils issue.

I'll leave that to Chris when he pushes the newest alpha tags to cesm3.0-alphabranch :) I did note on ESMCI/cime#4668 that master still has a few from distutils.spawn import find_executable, but the failure I'm seeing in the current tests is from from distutils import file_util and those have been removed.