ENIs fails to be Tagged by CNI

[vipulsabhaya]

The VPC CNI plugin allocates ENIs on-demand for Pods. CNI also tags all ENIs that it created with the tag 'node.k8s.amazonaws.com/instance_id'.

There is a race condition in the code, such that we attempt to CreateTag prior to the ENI being fully ready, which causes the CreateTag call to fail. We don't attempt to retry the tag creation.

The result is some ENIs have a Tag, and some don't.

We need to ensure all ENIs tags are reliable, so they can be used for reconciliation or cleanup.