Enable Datadog US1-FED target for log streaming

Feature: Enable Datadog US1-FED target for log streaming

Description: Please enable support for the FedRamp/Government version of Datadog. The site ID is US1-FED and its API URL is https://api.ddog-gov.com.

Use-case: We need access to the auth0 audit logs in the FedRamp version of the Datadog SIEM.