fix: allow changing the replica count for a v2 volume (backport #3268)

[mergify]

Which issue(s) this PR fixes:

Issue # longhorn/longhorn#9804 longhorn/longhorn#9805

What this PR does / why we need it:

allow changing the replica count for a v2 volume

Special notes for your reviewer:

Additional documentation or context

---

This is an automatic backport of pull request #3268 done by [Mergify](https://mergify.com).

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