feat: cleanup sentinel on server deletion

fix: Sentinel should not be enabled on build servers

app/Actions/Server/StopSentinel.php

@@ -13,6 +13,6 @@ class StopSentinel
     public function handle(Server $server)
     {
         instant_remote_process(['docker rm -f coolify-sentinel'], $server, false);
-        $server->sentinelUpdateAt(isReset: true);
+        $server->sentinelHeartbeat(isReset: true);
     }
 }