fix: cp-7.58.0 Make burn and null address sending a blocking alert (#22047)

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## **Description**

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This PR aims to make burn/null address sending alert to be a blocking
alert.

See the task details for further information

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CHANGELOG entry: Make burn and null address sending a blocking alert

## **Related issues**

Fixes: #22046

## **Manual testing steps**

N/A

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Make burn/null address alerts blocking and update tests accordingly.
> 
> - **Alerts**:
> - `useBurnAddressAlert`: Set `isBlocking: true` for `BurnAddress`
alert in `Severity.Danger`.
> - **Tests**:
> - Update `useBurnAddressAlert.test.ts` to expect `isBlocking: true`
for burn/null address cases (direct and nested recipients,
mixed/uppercase casing).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
9093654. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: OGPoyraz

app/components/Views/confirmations/hooks/alerts/useBurnAddressAlert.test.ts

@@ -56,7 +56,7 @@ describe('useBurnAddressAlert', () => {
       key: AlertKeys.BurnAddress,
       field: RowAlertKey.BurnAddress,
       severity: Severity.Danger,
-      isBlocking: false,
+      isBlocking: true,
     });
     expect(result.current[0].title).toBeDefined();
     expect(result.current[0].message).toBeDefined();
@@ -72,7 +72,7 @@ describe('useBurnAddressAlert', () => {
       key: AlertKeys.BurnAddress,
       field: RowAlertKey.BurnAddress,
       severity: Severity.Danger,
-      isBlocking: false,
+      isBlocking: true,
     });
   });
 
@@ -100,7 +100,7 @@ describe('useBurnAddressAlert', () => {
       key: AlertKeys.BurnAddress,
       field: RowAlertKey.BurnAddress,
       severity: Severity.Danger,
-      isBlocking: false,
+      isBlocking: true,
     });
   });
 

app/components/Views/confirmations/hooks/alerts/useBurnAddressAlert.ts

@@ -41,7 +41,7 @@ export function useBurnAddressAlert(): Alert[] {
         message: strings('alert_system.burn_address.message'),
         title: strings('alert_system.burn_address.title'),
         severity: Severity.Danger,
-        isBlocking: false,
+        isBlocking: true,
       },
     ];
   }, [hasBurnAddressRecipient]);