Feature request: Testing CESM+DART infrastructure about dart HOT 5 OPEN

Here's the SourceMods I developed for the CAM6 Reanalysis.
cesm2_1_relsd_m5.6z_DART+CAM_SourceMods.tgz

Here are the changes to CIME I made for the CAM6 Reanalysis, which are candidates for merging into main.
See the included file merge_list_2023-3-11 for details.
DART_CIME_maint-5.6_mods.tgz

There were more changes needed (or useful), but they are too specific to DART and the Reanalysis
to include. So we will still have mods that we need to install manually (unless there's a SourceMods
mechanism for CIME).

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It seems that we'll want to gather SourceMods (and other software variants)
from the other components that have DART interfaces; CLM, POP, and CICE. (MPAS?, ...?)
I don't have reliable access to those.

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CIME github issue #2455 shows that a multi-instance test for CAM ("dartcambigens")
has been developed and is being used in pre-beta tests .
This may work for other components, or it could be used as a template.

Jim Edwards would like DART to be able to run with no modifications to CIME,
so I'll open an issue in the CIME github to handle importing our changes.

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So far several CAM Reanalysis modifications to CESM2.1 have been resolved in CESM2.3 (CMEPS mode).

1. The slow creation of modelio_nml has been solved by handling them (in parallel) in fortran code, instead of serially in python.
2. The inability of the driver to write "daily" auxiliary coupler history files ("forcing") at the end of a forecast that's < 24 hours has been fixed in CMEPS.
3. The issue of incompatibilities between some (aux) history file names and their contents (related to averaging and the times in the files) appears to have been fixed by the uniformity and generality built into components/cmeps/cime_config/namelist_definition_drv.xml.

The next issue I'll try to resolve is DART's creation of several more file "types", that CESM's st_archive doesn't handle; means, spreads, obs_seq files, stages, etc.
The atm variation of this was controlled by

• components/cam/cime_config/config_archive.xml
• cime/config/cesm/config_archive.xml (->? in CESM2.3)
• cime/scripts/lib/CIME/case/case_st_archive.py (->? cime/CIME/case/case_st_archive.py)
• cime/src/drivers/mct/cime_config/config_archive.xml (->? ./cmeps/cime_config/config_archive.xml)

but there may be similar changes (hopefully the same) needed in the other components.
My version is in /glade/u/home/raeder/cesm2_1_relsd_m5.6/SourceMods/src.cam/config_archive.xml.
@braczka @amrhein @johnsonbk if you have any modified config_archive.xml for the ocn, lnd, etc.,
or strategies that you prefer for handling the new file types, please send them along.
We may need to do this for CICE too, but without an expert on hand.
I'd like to organize this before opening an issue in CESM.

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• running with calendar=GREGORIAN

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