[Nvidia-Imex] Update action sequence for service

Author: Himani Anil Deshpande

cookbooks/aws-parallelcluster-platform/resources/nvidia_imex/partial/_nvidia_imex_common.rb

@@ -64,7 +64,7 @@
   # Start nvidia-imex on p6e-gb200 and only on ComputeFleet
   if get_nvswitch_count(get_device_ids['gb200']) > 1
     service nvidia_imex_service do
-      action %i(start enable)
+      action %i(enable start)
       supports status: true
     end
   end

cookbooks/aws-parallelcluster-platform/spec/unit/resources/nvidia_imex_spec.rb

@@ -305,11 +305,11 @@ def self.configure(chef_run)
 
           if (platform == 'amazon' && version == '2') || %w(HeadNode LoginNode).include?(node_type)
             it 'does not configure nvidia-imex' do
-              is_expected.not_to start_service('nvidia-imex').with_action(%i(start enable)).with_supports({ status: true })
+              is_expected.not_to start_service('nvidia-imex').with_action(%i(enable start)).with_supports({ status: true })
             end
           else
             it 'it starts nvidia-imex service' do
-              is_expected.to start_service('nvidia-imex').with_action(%i(start enable)).with_supports({ status: true })
+              is_expected.to start_service('nvidia-imex').with_action(%i(enable start)).with_supports({ status: true })
             end
           end
         end
@@ -332,7 +332,7 @@ def self.configure(chef_run)
         end
 
         it 'does not configure nvidia-imex' do
-          is_expected.not_to start_service('nvidia-imex').with_action(%i(start enable)).with_supports({ status: true })
+          is_expected.not_to start_service('nvidia-imex').with_action(%i(enable start)).with_supports({ status: true })
         end
       end
     end