Bump kubernetes-csi/external-snapshotter to v8.2.0; Remove Snapshot Validation Webhook

[AndrewSirenko]

Issue #, if available:

Description of changes:

Bump kubernetes-csi/external-snapshotter to v8.2.0

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[AndrewSirenko]

snapshot-validation-webhook-usage deprecated in external-snapshotter v8.2.0

I will update this PR tomorrow with the changes that this requires.

[AndrewSirenko]

/retest

[AndrewSirenko]

/retest

Looks like flake?

Buildkit daemon is not running. Retrying.
Buildkit daemon is not running. Retrying.
Buildkit daemon is not available
{"component":"entrypoint","error":"wrapped process failed: exit status 1","file":"k8s.io/test-infra/prow/entrypoint/run.go:79","func":"k8s.io/test-infra/prow/entrypoint.Options.Run","level":"error","msg":"Error executing test process","severity":"error","time":"[20](https://prow.eks.amazonaws.com/view/s3/prowpresubmitsdataclusterstack-prowbucket7c73355c-vfwwxd2eb4gp/pr-logs/pull/aws_eks-distro/3458/external-snapshotter-1-27-presubmit/1868765811804475392#2:build-container-build-log.txt%3A20)24-12-16T21:14:42Z"}

[AndrewSirenko]

/retest

[vineeth-bandi]

/lgtm

[vineeth-bandi]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vineeth-bandi

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [vineeth-bandi]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment