RUM hardcoded retention filter endpoints removed; new Security Monitoring and Data Observability endpoints added

BreakingBreaking change

This is a breaking change — integrations that rely on the affected behaviour will need updates before the change rolls out.

What changed

This diff contains both breaking removals and additive additions:

Breaking: The entire RUM Retention Filters Hardcoded API surface is removed — endpoints GET /api/v2/rum/applications/{app_id}/retention_filters/hardcoded (list), GET /api/v2/rum/applications/{app_id}/retention_filters/hardcoded/{rf_id} (get), and PATCH /api/v2/rum/applications/{app_id}/retention_filters/hardcoded/{rf_id} (update) are gone, along with all associated schemas (RumHardcodedRetentionFilterAttributes, RumHardcodedCrossProductSampling, etc.) and path parameters.
Additive: New POST /api/v2/security_monitoring/rules/{rule_id}/restore/{version} endpoint added (beta) to restore a security monitoring rule to a historical version, with a new SecurityMonitoringRuleVersion path parameter.
Additive: New Data Observability API tag and schemas (DataObservabilityMonitorRunStatus, DataObservabilityMonitorRunType, GetDataObservabilityMonitorRunStatusResponse, etc.) added for monitoring data observability monitor run status.