feat(eks): support aws-node-termination-handler as the default spot draining handler

[pahud]

feat(aws-eks): support aws/aws-node-termination-handler as the default spot draining handler(fix #4913 )

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[mrsiejas]

@pahud @eladb Wondering how(if?) this is going to work with one of the Best practice recommendations which is Restricting access to the IMDS and Amazon EC2 instance profile credentials? If not, perhaps its a good idea to add it via new ticket?