[NVIDIA_IMEX] Not Install Nvidia-imex for Isolated regions

Author: Himani Anil Deshpande

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

@@ -17,7 +17,7 @@
 
 action :install do
   return unless nvidia_enabled_or_installed?
-  return if on_docker? || imex_installed
+  return if on_docker? || imex_installed || aws_region.start_with?("us-iso")
 
   # Add NVIDIA repo for nvidia-imex
   nvidia_repo 'add nvidia repository' do

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

@@ -165,6 +165,7 @@ def self.install(chef_run)
 
         before do
           chef_run.node.override['cluster']['shared_dir'] = shared_dir
+          chef_run.node.override['cluster']['region'] = 'aws_region'
           chef_run.node.override['cluster']['nvidia']['driver_version'] = nvidia_version
           ConvergeNvidiaImex.install(chef_run)
         end