Enhance README and activities with advanced notification filtering features
- Updated README to include new intelligent notification filtering capabilities, including TTL-based duplicate prevention and ignore lists.
- Enhanced `Formatters` activity to support notification filtering for scheduled reports and added detailed filtering logic.
- Improved `SlotManager` to implement advanced notification filtering with persistent alert detection and group-based filtering.
- Updated `Alerts` workflow to incorporate intelligent filtering for real-time error notifications, ensuring efficient alert delivery.
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