re-adding syserr for debugging

Author: mhlidd

components/environment/src/main/java/datadog/environment/ConfigHelper.java

@@ -81,10 +81,10 @@ public static String getEnvironmentVariable(String name) {
         && !configSource.getSupportedConfigurations().contains(name)) {
       if (configInversionStrict != ConfigInversionStrictStyle.TEST) {
         // TODO: Replace this log with Telemetry
-        //        System.err.println(
-        //            "Warning: Missing environment variable "
-        //                + name
-        //                + " from supported-configurations.json.");
+        System.err.println(
+            "Warning: Missing environment variable "
+                + name
+                + " from supported-configurations.json.");
         log.error(
             "Warning: Missing environment variable {} from supported-configurations.json.", name);
       }