Decouple dryRun from SessionMetadata

dryRun is only available via the (sessionless!) tool, and is not
a property of the session.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125203026

java/google/registry/flows/EppToolAction.java

@@ -51,10 +51,10 @@ public class EppToolAction implements Runnable {
         new StatelessRequestSessionMetadata(
             clientIdentifier,
             superuser,
-            dryRun,
             ProtocolDefinition.getVisibleServiceExtensionUris(),
             SessionSource.TOOL),
         new PasswordOnlyTransportCredentials(),
+        dryRun,
         xml.getBytes(UTF_8));
   }