[Security Solution][Alerts] Reset selected rows when page index changes (#243729)

> [!warning]
> **I am not sure this is the right way to fix this issue**.
> If you are a reviewer and have a better idea, your suggestion is more
than welcome

## Summary

Addresses #243190

### 🛑 The problem

As highlighted in the aforementioned issue, the selection of rows in the
alerts table would persist when turning page.
This is a screen-recording of the issue:

https://github.com/user-attachments/assets/a3b3444a-9253-41d1-b89b-072907c7043c

### 🔍 Context

- Clearing the selection after changing page is what was happening in
previous versions of kibana
- I have noticed that in discovery we do not do this, but in other parts
of kibana we do
- I couldn't really narrow the commit that caused this to happen, so I
have implemented my own solution

### 💡 The solution

I have added a "dependency" to the effect that resets the selection when
the page size changes — I thought it was the appropriate place to do it.

(cherry picked from commit cc0f9c9)

Author: NicholasPeretti

src/platform/packages/shared/response-ops/alerts-table/hooks/use_alerts_table_query_params.ts

@@ -94,7 +94,7 @@ export const useAlertsTableQueryParams = ({
           pageSize,
         }
       );
-      if (resetPageIndex) {
+      if (resetPageIndex || pageIndex !== prevQueryParams.pageIndex) {
         // Clear any bulk actions selections when the query changes
         dispatchBulkAction({ action: BulkActionsVerbs.clear });
       }