Use AuthenticatedRegistrarAccessor in EppConsoleAction

EppConsoleAction still "manually" checks access by going over the
RegistrarContacts. We need it to use AuthenticatedRegistrarAccessor just like
every other part of the registrar console.

We still need to remove the (now unneeded) login EPP sent by the console, but that's left for a followup CL.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=222404208

java/google/registry/request/auth/AuthenticatedRegistrarAccessor.java

@@ -203,9 +203,13 @@ public class AuthenticatedRegistrarAccessor {
     logger.atInfo().log("%s has %s access to registrar %s.", userIdForLogging, roles, clientId);
   }
 
+  public String userIdForLogging() {
+    return userIdForLogging;
+  }
+
   @Override
   public String toString() {
-    return toStringHelper(getClass()).add("authResult", userIdForLogging).toString();
+    return toStringHelper(getClass()).add("user", userIdForLogging).toString();
   }
 
   private static boolean checkIsSupport(