kvserver: incorporate blob file rewrite bytes read, written into compacted bytes timeseries

[annrpom]

Follow up of: cockroachdb/pebble#5444

We should incorporate our new metrics that encapsulate blob file rewrite bytes read, written into the CockroachDB compacted bytes timeseries metrics.

Jira issue: CRDB-56353

[blathers-crl]

Hi @annrpom, please add a branch-* label to identify the earliest affected branch for this C-bug

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