dashboards release v4.10.0

Added

• Add Alloy Metrics Targets dashboard
• Add beyla-based Network Traffic Analysis

Changed

• Update Envoy Gateway dashboards and make them public.

Removed

• Remove the alertmanager-overview dashboard in favor of the better Mimir / Alertmanager dashboard
• Clean up alertmanager-mixin auto-update scripts
• Remove dashboards about deprecated components (Prometheus, Promxy, Prometheus-agent, Promtail)