Adding dask to ctsm_pylib

[samsrabin]

Description of changes

Adds dask 2025.7.0 to ctsm_pylib.

Specific notes

Contributors other than yourself, if any: None

CTSM Issues Fixed:

• Resolves mesh_plotter instructions include nonexistent py_env_create --dask option #3380
• Resolves Add dask to ctsm_pylib #3381

Are answers expected to change (and if so in what way)? No

Any User Interface Changes (namelist or namelist defaults changes)? No

Does this create a need to change or add documentation? Did you do so? No

Testing performed, if any:

• Python unit tests on Derecho
• Python system tests on Derecho
• clm_pymods suite comparing to ctsm5.3.071

[ekluzek]

Obviously dead simple, so can come in.

The one suggestion I have though that we should make sure we do is to update the

README.python_pkgs.rst

file, and remove the line about dask. There's a couple other lines that should be changed as well to align with how we are doing things now. We could do that here, or in another small PR to b4b-dev.

I also find mention of dask, scattered throughout the repo, and we likely should handle some of those. A lot of those are crop calendar things that you can handle @samrabin. I added handling the others as part of #3380.

[samsrabin]

Good catch, @ekluzek. I've deleted references to dask where they don't belong. There are other references but those should stay.