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/tools/ValidateLoginCredentialsCommand.java

@@ -109,6 +109,7 @@ final class ValidateLoginCredentialsCommand implements RemoteApiCommand, GtechCo
                 clientCertificateHash,
                 Optional.of(clientIpAddress),
                 "placeholder"),  // behave as if we have SNI on, since we're validating a cert
+            false,
             inputXmlBytes,
             null,
             new SystemClock()).run()), UTF_8));