Enable EnKF-only for atmosphere (#219)

This PR works along with the following three dependent PRs to enable the
EnKF-only configuration for the atmosphere within the global workflow
(see detailed description
NOAA-EMC/global-workflow#4345)

Dependencies:
-NOAA-EMC/global-workflow#4345
-#2010
-NOAA-EMC/jcb#32

Resolve
- NOAA-EMC/global-workflow#4339

---------

Co-authored-by: Cory Martin <cory.r.martin@noaa.gov>

Author: bhuang95

parm/jcb-gdas/algorithm/atmosphere/fv3jedi_fv3inc_lgetkf.yaml.j2

@@ -106,10 +106,16 @@ members from template:
       datapath: ./anl/mem%mem%
       filename: cubed_sphere_grid_atminc.jedi.nc
     fv3 increment output:
+{% if atm_enkfonly | default(false) %}
+      filetype: fms restart
+      is restart: false
+      filename_nonrestart: {{ atmosphere_ensemble_analysis_prefix }}cubed_sphere_grid_atminc.nc
+{% else %}
       filetype: cube sphere history
       provider: ufs
-      datapath: ./anl/mem%mem%
       filename: {{ atmosphere_ensemble_analysis_prefix }}cubed_sphere_grid_atminc.nc
+{% endif %}
+      datapath: ./anl/mem%mem%
       field io names:
         eastward_wind: u_inc
         northward_wind: v_inc