DOC-14614: Product Change- PR #151689 - sql: add routine statement counters for tracking execution metrics

- In available-metrics-in-metrics-list.csv, added 8 sql.routine.* metrics.
- Updated metrics.yaml, ran `./cockroach gen metric-list > metrics.yaml` with v25.4.0-rc.1 binary.
- In v25.3/essential-metrics.md and v25.4/essential-metrics.md, fixed bug where it mentioned self-hosted on Advanced page.
- In v25.4/essential-metrics.md, added sections for Physical Replication and Logical Replication.

Author: florence-crl

src/current/_data/v25.4/metrics/available-metrics-in-metrics-list.csv

@@ -483,3 +483,11 @@ rebalancing.range.rebalances
 rebalancing.replicas.cpunanospersecond
 rebalancing.replicas.queriespersecond
 rebalancing.state.imbalanced_overfull_options_exhausted
+sql.routine.delete.count
+sql.routine.delete.started.count
+sql.routine.insert.count
+sql.routine.insert.started.count
+sql.routine.select.count
+sql.routine.select.started.count
+sql.routine.update.count
+sql.routine.update.started.count