PR #95963 - kvserver: use narrow checkpoints in consistency checker

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#95963
Commit: cockroachdb/cockroach@f01c861

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Release note (ops change): In the rare event of Range inconsistency, the
consistency checker saves a storage checkpoint on each storage the Range
belongs to. Previously, this was a full checkpoint, so its cost could quickly
escalate on the nodes that went on running. This change makes the checkpoints
partial, i.e. they now only contain the relevant range and its neighbours. This
eliminates the time pressure on the cluster operator to remove the checkpoints.

Epic: none

Jira Issue: DOC-6873