DOC-14919: Product Change- PR #151946 - metric: add labels for sql.*.started.count

[florence-crl]

Fixes DOC-14919 DOC-14953

• In available-metrics-in-metrics-list.csv, added 4 metrics sql.*.started.count.
• In essential-metrics.md, added link to metrics endpoint.

Rendered previews

• Essential Metrics for CockroachDB Advanced Deployments
• Available Metrics

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[github-actions]

Files changed:

• src/current/_data/v25.4/metrics/available-metrics-in-metrics-list.csv
• src/current/_includes/v25.4/essential-metrics.md:
• src/current/v25.4/essential-metrics-self-hosted.md
• src/current/v25.4/essential-metrics-advanced.md

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