Preparing the marine DA for the HR WCDA test

[guillaumevernieres]

Full issue is here:
NOAA-EMC/global-workflow#3227

TODO list

• Get the MOM6-CICE6 restarts from the replay on AWS.  #1453
  Source: https://noaa-ufs-gefsv13replay-pds.s3.amazonaws.com/index.html#2023/04/2023041506/
  Destination: /work/noaa/da/gvernier/ensda/ictest/1440x1080x75/HR-test
• @CatherineThomas-NOAA will cycle the atmos only config to get to the closest MOM6/CICE6 replay IC's.
• Prepare the enkf and gdas coupled IC's (probably @guillaumevernieres)
• Make sure we have the obs for the period of interest: 2023041500 to 20230630 (TBD @apchoiCMD )
• Build the g-w and cycle the 3DVAR existing test case (@JohnSteffen-NOAA )

Branches/PR's to start work with

• global-workflow: https://github.com/guillaumevernieres/global-workflow/tree/feature/lowres-b
• GDASApp: Add code changes for the implementation of the low-resolution B #1441
• jcb-gdas: https://github.com/NOAA-EMC/jcb-gdas/tree/feature/lowres-b
• A few JEDI fixes are required too