Add variable to supported configurations

Author: manuel-alvarez-alvarez

metadata/supported-configurations.json

@@ -17,6 +17,7 @@
     "DD_API_KEY": ["A"],
     "DD_API_KEY_FILE": ["A"],
     "DD_API_SECURITY_DOWNSTREAM_REQUEST_ANALYSIS_SAMPLE_RATE": ["A"],
+    "DD_API_SECURITY_DOWNSTREAM_REQUEST_BODY_ANALYSIS_SAMPLE_RATE": ["A"],
     "DD_API_SECURITY_ENABLED": ["A"],
     "DD_API_SECURITY_ENDPOINT_COLLECTION_ENABLED": ["A"],
     "DD_API_SECURITY_ENDPOINT_COLLECTION_MESSAGE_LIMIT": ["A"],