Build GDASApp and unset memory in Gaea-C5 xml files (NOAA-EMC#2912)

In preparation for GDASApp CI tests, add GDASApp build capability to
global-workflow and remove memory specifications for Gaea-C5 xml setup
(in Ref to NOAA-EMC#2727)
  Resolves NOAA-EMC#2535 
  Resolves NOAA-EMC#2910 
  Resolves NOAA-EMC#2911

parm/config/gfs/config.resources.GAEA

@@ -21,6 +21,7 @@ case ${step} in
 
 esac
 
+unset memory
 # shellcheck disable=SC2312
 for mem_var in $(env | grep '^memory_' | cut -d= -f1); do
   unset "${mem_var}"

sorc/build_all.sh

@@ -145,7 +145,7 @@ build_opts["ww3prepost"]="${_wave_opt} ${_verbose_opt} ${_build_ufs_opt} ${_buil
 
 # Optional DA builds
 if [[ "${_build_ufsda}" == "YES" ]]; then
-   if [[ "${MACHINE_ID}" != "orion" && "${MACHINE_ID}" != "hera" && "${MACHINE_ID}" != "hercules" && "${MACHINE_ID}" != "wcoss2" && "${MACHINE_ID}" != "noaacloud" ]]; then
+   if [[ "${MACHINE_ID}" != "orion" && "${MACHINE_ID}" != "hera" && "${MACHINE_ID}" != "hercules" && "${MACHINE_ID}" != "wcoss2" && "${MACHINE_ID}" != "noaacloud" && "${MACHINE_ID}" != "gaea" ]]; then
       echo "NOTE: The GDAS App is not supported on ${MACHINE_ID}.  Disabling build."
    else
       build_jobs["gdas"]=8