fix: Fix race condition validating ERC20 transfer (blockaid) (#28487)

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## **Description**
Fixed race condition when validating ERC20 transfer and enabled ERC20
transfer blockaid e2e.

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also include relevant motivation and context. Have in mind the following
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1. What is the reason for the change?
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[![Open in GitHub
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## **Related issues**

Fixes: #28434

## **Manual testing steps**

1. Go to this the test dapp
2. Click and reject (fast ) all types of requests in the section: PPOM -
Malicious Transactions and Signatures
3. Should not get stuck in the loader

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

[all PPOM
signatures.webm](https://github.com/user-attachments/assets/b59a965a-f5e9-44e6-93a5-9058cd164933)

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
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Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
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Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

app/scripts/lib/ppom/security-alerts-api.ts

@@ -51,7 +51,7 @@ async function request(endpoint: string, options?: RequestInit) {
     );
   }
 
-  return response.json();
+  return await response.json();
 }
 
 function getUrl(endpoint: string) {

app/scripts/metamask-controller.js

@@ -5133,7 +5133,7 @@ export default class MetamaskController extends EventEmitter {
     securityAlertId,
     securityAlertResponse,
   ) {
-    updateSecurityAlertResponse({
+    await updateSecurityAlertResponse({
       appStateController: this.appStateController,
       method,
       securityAlertId,