[Response Ops] Add alerts page to search project (elastic#222600)

## Summary

Closes elastic#221257 - Add stack alerts page to search project

New menu item
<img width="539" alt="Screenshot 2025-06-04 at 17 30 41"
src="https://github.com/user-attachments/assets/68edf12f-957d-4a9e-bc0a-dada96db0a06"
/>


Alert page
<img width="926" alt="Screenshot 2025-06-04 at 17 30 50"
src="https://github.com/user-attachments/assets/a07a624d-727f-4eb2-9ab5-69d5fe11030f"
/>

Author: jcger

src/platform/packages/shared/deeplinks/management/deep_links.ts

@@ -66,6 +66,7 @@ export type ManagementId =
   | 'trained_models'
   | 'transform'
   | 'triggersActions'
+  | 'triggersActionsAlerts'
   | 'triggersActionsConnectors'
   | 'upgrade_assistant'
   | 'users'

x-pack/solutions/search/plugins/serverless_search/public/navigation_tree.ts

@@ -226,6 +226,7 @@ export const navigationTree = ({ isAppRegistered }: ApplicationStart): Navigatio
                     }),
                     breadcrumbStatus: 'hidden',
                     children: [
+                      { link: 'management:triggersActionsAlerts', breadcrumbStatus: 'hidden' },
                       { link: 'management:triggersActions', breadcrumbStatus: 'hidden' },
                       { link: 'management:triggersActionsConnectors', breadcrumbStatus: 'hidden' },
                     ],