Use NAT64 instead of dual-stack for AWS EBS CSI driver

[hakman]

AWS_EC2_ENDPOINT=https://api.ec2.us-east-1.aws is broken as it overrides both EC2 and STS endpoint (#12843 (comment)).

2021/11/28 02:57:37 DEBUG: Request sts/AssumeRoleWithWebIdentity Details:
---[ REQUEST POST-SIGN ]-----------------------------
POST / HTTP/1.1
Host: api.ec2.us-east-1.aws
User-Agent: aws-sdk-go/1.40.4 (go1.17.3; linux; amd64) exec-env/aws-ebs-csi-driver-v1.5.0
Content-Length: 1291
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Accept-Encoding: gzip

The above is not needed with NAT64 and using AWS_USE_DUALSTACK_ENDPOINT=true needs more testing.

/cc @johngmyers @olemarkus @rifelpet

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[johngmyers]

File an issue against kubernetes-sigs/aws-ebs-csi-driver?

[hakman]

File an issue against kubernetes-sigs/aws-ebs-csi-driver?

kubernetes-sigs/aws-ebs-csi-driver#1122

[hakman]

/test pull-kops-e2e-ipv6-calico

[hakman]

The IPv6 test is now passing without any issues:

Ginkgo ran 1 suite in 20m44.576668224s
Test Suite Passed