Changed log level for message with authz opt out (#199678)

## Summary

Changed log level for message with authz opt out from `warn` to `debug`


__Closes: https://github.com/elastic/kibana/issues/199677__

x-pack/plugins/security/server/authorization/api_authorization.ts

@@ -48,10 +48,6 @@ export function initAPIAuthorization(
 
     if (security) {
       if (isAuthzDisabled(security.authz)) {
-        logger.warn(
-          `Route authz is disabled for ${request.url.pathname}${request.url.search}": ${security.authz.reason}`
-        );
-
         return toolkit.next();
       }