Fix gdas build on Gaea and add Gaea to available CI list (NOAA-EMC#2857)

Module git-lfs is required to run CI test on gaea machine and added
gaea in the Jenkinsfile
- Module (git-lfs) added in the modulefiles/module_gwsetup.gaea.lua
- Gaea added (Jenkinsfile)

ci/Jenkinsfile

@@ -78,7 +78,7 @@ pipeline {
                     Machine = machine[0].toUpperCase() + machine.substring(1)
                     echo "Getting Common Workspace for ${Machine}"
                     ws("${custom_workspace[machine]}/${env.CHANGE_ID}") {
-                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'Hercules-EMC', 'Hera-EMC', 'Orion-EMC'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
+                        properties([parameters([[$class: 'NodeParameterDefinition', allowedSlaves: ['built-in', 'Hercules-EMC', 'Hera-EMC', 'Orion-EMC', 'Gaea'], defaultSlaves: ['built-in'], name: '', nodeEligibility: [$class: 'AllNodeEligibility'], triggerIfResult: 'allCases']])])
                         GH = sh(script: "which gh || echo '~/bin/gh'", returnStdout: true).trim()
                         CUSTOM_WORKSPACE = "${WORKSPACE}"
                         sh(script: "mkdir -p ${CUSTOM_WORKSPACE}/RUNTESTS;rm -Rf ${CUSTOM_WORKSPACE}/RUNTESTS/*")

modulefiles/module_gwsetup.gaea.lua

@@ -15,5 +15,6 @@ load(pathJoin("python", python_ver))
 load("py-jinja2")
 load("py-pyyaml")
 load("py-numpy")
+load("git-lfs")
 
 whatis("Description: GFS run setup environment")