Update otel_host_metrics_dashboard.json (DataDog#23639)

* Update otel_host_metrics_dashboard.json

Applies semantic_mode native because we strictly want this to include the OTel host metrics only. 

Also explicitly queries system metrics with and without otel prefixes for backwards compatibility.

* fix formatting

* Remove pause_auto_refresh from OTel host metrics dashboard

The datadog-assets validate-dashboards schema rejects this property
(Additional properties are not allowed).

Co-authored-by: Cursor <cursoragent@cursor.com>

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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Pablo Baeyens <pablo.baeyens@datadoghq.com>

Author: 3 people