PR #106094 - kvserver: add raft.replication.latency histogram

Exalate commented:

Related PR: https://github.com/cockroachdb/cockroach/pull/106094
Commit: https://github.com/cockroachdb/cockroach/commit/848057113e9eb919cebdb4653c7ccc084aba8688
Epic: CRDB-25287

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Release note (ops change): a histogram metric raft.replication.latency was added.
It tracks the time between evaluation and application of the command. This includes
time spent in the quota pool, in replication (including reproposals) as well as log
application, but notably *not* sequencing latency, i.e. contention and latch
acquisition.

Jira Issue: DOC-8271