Description

This PR updates the Redis OTel instrumentation to use the instrument types required by the OpenTelemetry database semantic conventions. Connection pool metrics are modeled as UpDownCounters rather than ObservableGauges, so db.client.connection.count and db.client.connection.pending_requests need to be updated.

Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?