What type of PR is this?

/kind feature

/sig storage

What this PR does / why we need it:

CSIMigrationAWS has been beta since 1.17, on by default since 1.23, this takes it to GA for 1.25.
kubernetes/enhancements#1487

Which issue(s) this PR fixes:

Special notes for your reviewer:

I am still working on Windows and upgrade tests, aim to complete this week but opening the PR now as placeholder.

Testing:

• Automated existing in-tree plugin tests for the migrated driver have been running in driver CI since alpha/beta: https://testgrid.k8s.io/provider-aws-ebs-csi-driver#ci-migration-test. Implementation: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/tests/e2e-kubernetes/e2e_test.go#L85-L94 / https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/hack/e2e/ebs.sh#L8
• Manual Windows Nodes test. (Resize was never supported by in-tree so I will skip expand tests. For promoting off->on by default*, there was no official vendor-supported AWS+Windows Nodes setup to test so I had to hack my own VM/driver images. As of April this year now EKS has Windows Nodes with CSI support https://docs.aws.amazon.com/eks/latest/userguide/eks-ami-versions-windows.html so for GA I will be using that to test. However, there is no official EKS 1.23 Kubernetes Control Plane with migration enabled (yet) so I have to hack that together again, and since it is not public/reproducible you will have to take my word for it that the tests succeed!)
  • Pre-upgrade EKS 1.22 control plane + EKS 1.22 Windows Nodes in-tree plugin test (sanity check that my cluster is configured properly). PASSED with caveat: I hit the 'volume stuck attaching' bug which affects Windows in-tree but is fixed in CSI by Platform agnostic device removal kubernetes-sigs/aws-ebs-csi-driver#1193
  • Post-upgrade EKS 1.23 control plane + EKS 1.22 Windows Nodes "partially" migrated plugin test. PASSED with caveat: ephemeral containers step of should store data test cases fail on EKS due to EKS specific issue, it's not related to CSI: Clear ephemeral container resources field when creating one in volume test #111521
  • Post-upgrade EKS 1.23 control plane + EKS 1.23 Windows Nodes "fully" migrated plugin test ip-192-168-71-159.us-west-2.compute.internal Ready <none> 37m v1.23.7-eks-4721010 192.168.71.159 34.222.140.157 Windows Server 2019 Datacenter 10.0.17763.3165 docker://20.10.9. PASSED with caveat: 'should mount multiple PV pointing to the same storage on the same node' test case fails because it's not applicable to 1.23 Nodes, I am executing master e2e.test against 1.23 Nodes
• Manual upgrade/skew test. (For promoting off->on by default*, I wrote/ran a test to toggle the feature gate on which is effectively the same thing as upgrade: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/tests/e2e-upgrade/e2e_test.go#L70. For GA I will repeat this test.)
  • Pre-upgrade KOPS 1.25 control plane + KOPS 1.25 Nodes in-tree plugin test. Disable migration on kubelet/KCM and create a workload (Pod+PVC+PV), in-tree driver should do all operations here
  • Post-upgrade KOPS 1.25 control plane + KOPS 1.25 Nodes "fully" migrated plugin test. Enable migration on kubelet/KCM, the existing workload should continue to work (besides eviction/recreation of Pod during kubelet drain+update for enabling migration), csi driver should do all operations here

MISC NOTES FOR SELF (sorry, I am editing this PR frequently with notes/progress so to keep above checklist comprehensible dumping stuff here):

Disable migration means:

cloudProvider: aws
featureGates:
  CSIMigration: "false"
  CSIMigrationAWS: "false"

Windows test
./_output/bin/e2e.test --ginkgo.focus="aws.*ntfs" \ --ginkgo.skip="LinuxOnly|expand" \ --kubeconfig=$HOME/.kube/config \ --node-os-distro=windows \ --gce-zone=us-west-2a \ --provider=aws

{"msg":"FAILED [sig-storage] In-tree Volumes [Driver: aws] [Testpattern: Dynamic PV (ntfs)][Feature:Windows] subPath should support creating multiple subpathfrom same volumes [Slow]","completed":19,"skipped":6573,"failed":1,"failures":["[sig-storage] In-tree Volumes [Driver: aws] [Testpattern: Dynamic PV (ntfs)][Feature:Windows] subPath should support creating multiple subpath from same volumes [Slow]"]}~

Does this PR introduce a user-facing change?

CSIMigrationAWS upgraded to GA and locked to true.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

• KEP: https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1487-csi-migration-aws