feat: refactor v2 linked clone feature (backport #1404)

[mergify]

Which issue(s) this PR fixes:

Issue longhorn/longhorn#12552

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 #1404 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of b7490f4 has failed:

On branch mergify/bp/v1.12.x/pr-1404
Your branch is up to date with 'origin/v1.12.x'.

You are currently cherry-picking commit b7490f43.
  (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)

Changes to be committed:
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/api/types.go
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/client/client_engine.go
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/spdk/engine.go
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/spdk/replica.go
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/spdk/server_engine.go
	modified:   vendor/github.com/longhorn/longhorn-spdk-engine/pkg/spdk/types.go
	modified:   vendor/github.com/longhorn/types/pkg/generated/imrpc/proxy.pb.go
	modified:   vendor/github.com/longhorn/types/pkg/generated/spdkrpc/spdk.pb.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum
	both modified:   vendor/modules.txt

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