Werk #15893: ntop_alerts: introduce pagination to ntop alerts dashboard backend

Previously the alerts dashboard would fetch 5 hours of alert data by default or the time range selected by the user via the time series graphs. This caused performance issues since the number of alerts could vary greatly, often resulting in timeouts. This werk addresses this problem by introducing pagination on the backend. We now only fetch 20 alerts in any given api call. The user can then request more using the next button.

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