[3.5] Set the backend again after recovering v3 backend from snapshot #13501
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Fix issues/13494.
When etcd recovers v3 backend from a snapshot, then it closes the old backend, see backend.go#L107. So we should set the backend for the consistentIndex again in this case.
This PR is for 3.5. A separate PR pull/13500 has already been submitted for the main branch.
cc @ptabor @serathius @jingyih
/kind bug