Add resource metrics release notes & update API changes with new metrics, reorder what's new

[Simran-B]

Description

• [COR-5] Expose resource metrics arangodb#22088

Upstream PRs

• 3.10:
• 3.11:
• 3.12:
• 4.0:

---

Note

Adds new metrics to API/What's New (resource, deployment metadata, recording, RocksDB), reorders sections, and fixes a Known Issues table entry.

• Release notes (3.12, 4.0):
  • API changes:
    • Add metrics introduced in v3.12.5 (arangodb_api_recording_call_time), v3.12.6 (arangodb_aql_recording_call_time, rocksdb_*), and v3.12.7 (deployment metadata and resource stats: arangodb_metadata_*, arangodb_server_statistics_*).
  • What’s New:
    • Reorder sections: move Access tokens up; move RocksDB upgrade below recording sections.
    • Add sections and tables for new metrics: deployment metadata (arangodb_metadata_*) and resource metrics (arangodb_server_statistics_*).
• Known issues (3.12):
  • Fix/normalize table row for rapidly changing replicationFactor returning 412 Precondition Failed (BTS-2279).

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