fix: disable clone for v2 volume (backport #3191)

[mergify]

Which issue(s) this PR fixes:

longhorn/longhorn#9106

What this PR does / why we need it:

Special notes for your reviewer:

Additional documentation or context

---

This is an automatic backport of pull request #3191 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of a3dbb45 has failed:

On branch mergify/bp/v1.7.x/pr-3191
Your branch is ahead of 'origin/v1.7.x' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit a3dbb45f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   webhook/resources/volume/validator.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[shuo-wu]

Close this as the conflict is resolved in #3197