Notify on every incoming DOWN Push heartbeat

📑 I have found these related issues/pull requests I haven't found any existing issues or pull requests addressing this specific behavior. 🔖 Feature description 'm using Uptime Kuma Push monitors to receive notifications from external scripts and agents running on remote Linux machines. Currently, when a Push monitor changes from UP to DOWN, Uptime Kuma sends a notification. However, if another DOWN heartbeat is received while the monitor is already DOWN, no new notification is triggered. This means that if an external agent detects a new problem and sends another DOWN Push request, I won't receive a notification unless the monitor has changed its state in between. For my use case, each incoming DOWN Push request represents a new alert event that I would like to be notified about, even if the monitor is already in the DOWN state. ✔️ Solution I would like to propose an optional setting for Push monitors: Notify on every DOWN Push When enabled: Send a notificati…