[Response Ops][Alerting] Add missing acknowledged alert state copy (elastic#226020)

## Summary

Includes `acknowledged` alert state to inactive description

<img width="798" alt="Screenshot 2025-07-01 at 16 27 24"
src="https://github.com/user-attachments/assets/31db6a17-7d4b-45fe-a098-691896ad1b23"
/>

Author: jcger

src/platform/packages/shared/response-ops/alerts-delete/translations.ts

@@ -47,7 +47,7 @@ export const INACTIVE_ALERTS_DESCRIPTION = i18n.translate(
   'responseOpsAlertDelete.inactiveAlertsDescription',
   {
     defaultMessage:
-      'Remove alerts that were recovered, closed, or untracked longer than the threshold',
+      'Remove alerts that were recovered, closed, acknowledged, or untracked longer than the threshold',
   }
 );