feat(healthcheck): add retries before notifying (default: 3 times)

- Introduced NotifyFunc type for customizable notification handling in tests.
- Added Retries field to HealthCheckConfig for controlling notification thresholds.
- Implemented tests for notification behavior under various health check scenarios.

internal/notif/dispatcher.go

@@ -25,6 +25,8 @@ type (
 		Body  LogBody
 		Color Color
 	}
+
+	NotifyFunc func(msg *LogMessage)
 )
 
 var dispatcher *Dispatcher