remove validation-webhook as it is

[yati1998]

removes validation webhook as it is being depreciated

fixes: #1181

Removes validation-webhook

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @yati1998. Thanks for your PR.

I'm waiting for a kubernetes-csi member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[leonardoce]

The validation webhook would prevent creating multiple default volume snapshot classes (and multiple volume group snapshot classes) for the same CSI driver.
The CEL rules we included won't do that, and the corresponding error will be raised when dynamically provisioning a VolumeSnapshot or VolumeGroupSnapshot.

In my opinion, this is a behavior change that we should appropriately describe in the documentation and the release notes.

[xing-yang]

/ok-to-test

Please fix your commit message.

[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.