Revert "pin CW addon to v4.10.3-eksbuild.1 (#334)" (#335)

This reverts commit 8b3584d.

*Description of changes:*

Revert
#334
since CloudWatch Agent releases EKS add-on v5.3.1, has addressed EKS
resource detector issue.


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Author: wangzlei

scripts/eks/appsignals/enable-app-signals.sh

@@ -59,7 +59,6 @@ if [[ "${result}" == *"No addon: "* ]];  then
     aws eks create-addon \
         --cluster-name ${CLUSTER_NAME} \
         --addon-name amazon-cloudwatch-observability \
-        --addon-version v4.10.3-eksbuild.1 \
         --region ${REGION}
     # wait until the amazon-cloudwatch-observability add-on is active    
     # Fetch the initial status