move NCEP reanalysis data to ClimaArtifacts

[juliasloan25]

Recently, we've seen some jobs failing with the following error

ERROR: LoadError: RequestError: Operation too slow. Less than 1 bytes/sec transferred the last 20 seconds while requesting https://downloads.psl.noaa.gov/Datasets/ncep.reanalysis2/Monthlies/gaussian_grid/ulwrf.ntat.mon.mean.nc

To avoid downloading this dataset from NOAA each time we run a simulation, we should instead add this dataset directly to ClimaArtifacts.jl and access it through that.