Problem

DatadogDashboard controller has a hardcoded 60-minute force sync period, unlike DatadogMonitor which supports DD_MONITOR_FORCE_SYNC_PERIOD. This means dashboard drift from manual UI changes can persist for up to 60 minutes.

Proposed Solution

Add DD_DASHBOARD_FORCE_SYNC_PERIOD environment variable to configure dashboard sync frequency, similar to the existing DatadogMonitor implementation.