Remove explicit variants for ewok-env in configs/templates/skylab-dev/spack.yaml and configs/templates/unified-dev/spack.yaml, since they are the defaults

Author: climbfuji

configs/templates/skylab-dev/spack.yaml

@@ -8,7 +8,7 @@ spack:
   include: []
 
   specs:
-  - ewok-env +ecflow ~cylc
+  - ewok-env
   #- ai-env
   - geos-gcm-env          ^esmf@=8.6.1
   - jedi-fv3-env

configs/templates/unified-dev/spack.yaml

@@ -8,7 +8,7 @@ spack:
   include: []
 
   specs:
-  - ewok-env +ecflow ~cylc
+  - ewok-env
   #- ai-env
   - geos-gcm-env          ^esmf@=8.6.1
   - global-workflow-env   ^esmf@=8.6.1 ^crtm@=3.1.2