fix: Pod Identity cleanup issue when lab not complete (#885)

Co-authored-by: erichei <erichei@amazon.com>
Co-authored-by: heinrichse <114415716+heinrichse@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

manifests/modules/security/eks-pod-identity/.workshop/cleanup.sh

@@ -4,7 +4,7 @@ set -e
 
 POD_ASSOCIATION_ID=$(aws eks list-pod-identity-associations --region $AWS_REGION --cluster-name $EKS_CLUSTER_NAME --service-account carts --namespace carts --output text --query 'associations[0].associationId')
 
-if [ ! -z "$POD_ASSOCIATION_ID" ]; then
+if [ "$POD_ASSOCIATION_ID" != "None" ]; then
   logmessage "Deleting EKS Pod Identity Association..."
 
   aws eks delete-pod-identity-association --region $AWS_REGION --association-id $POD_ASSOCIATION_ID --cluster-name $EKS_CLUSTER_NAME