Mute Datadog alerts for planned downtime

Datadog's Terraform provider v4.0.0 is now available, introducing significant improvements like support for monitors as code via the new `datadog_monitor` resource and enhanced organization and consistency across resources. This release streamlines infrastructure-as-code management for Datadog, enabling more robust and repeatable configurations while simplifying overall adoption of Terraform. It also includes numerous bug fixes and performance optimizations.