Alert Handlers - Configurable Repeated Execution of Alert Handlers

Enable alert handlers to run repeatedly based on user-defined criteria, similar to "Periodic Notifications."

In certain scenarios, it may be necessary to execute a specific alert handler multiple times during an outage or disruption. For example, after a service failure, the system could perform a soft restart after 5 minutes, a hard restart after 10 minutes, and issue an alert at 15 minutes if the issue persists. Another use case is when an alert handler action fails for any reason - the system could automatically retry the action after 2 minutes.

Users should be able to define re-execution conditions such as time or count intervals, set a maximum number of executions to prevent infinite loops, and specify different actions for subsequent runs if required.

This enhancement would significantly improve the system's ability to manage persistent issues and enable more sophisticated, automated response scenarios.