fix(controller/reporting): rate limit k8s events & add external cancellation

kuyaseg-controller/src/reporting/otel.rs

@@ -98,3 +98,9 @@ impl OtelAggregator {
         todo!("Metrics are not implemented and should not be used for now")
     }
 }
+
+impl Drop for OtelAggregator {
+    fn drop(&mut self) {
+        self.force_flush();
+    }
+}