Use EPIC-managed spack-stack installations for non-production machines

[DavidHuber-NOAA]

The UFS has migrated to spack-stack/1.4.1 and there is work being done to migrate the GSI to the same (NOAA-EMC/GSI#589) on non-production machines (WCOSS2 is still using Intel/19). The GSI-utils should also be migrated to use spack-stack. This will involve a few upgrades at once: Intel 18 to 2021+, hdf5/1.10.6 to 1.14.0, and netcdf/4.7.4 to 4.9.2. It should be noted that during a port to a NESDIS GCP instance, the only compiler available was Intel 2021. The GSI utilities ran fine at coarser resolutions, but the EnKF recentering utility sometimes failed at ensemble resolution C192.

I am going to try this in one step to bypass #13 (since hpc-stack is minimally supported) and address #15. My suggested plan for testing is to run 40 cycles in the global workflow at all available resolutions up to C384/C192 and 4 additional cycles at C768/C384 as it is the only application that makes use of this utility suite.

[RussTreadon-NOAA]

@DavidHuber-NOAA , does PR #19 close this issue?

[DavidHuber-NOAA]

Yes, thanks. I'll close it now and add the reference to #19.