feat: enable account syncing in production (#28596)

## **Description**

This PR enables account syncing in production

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## **Related issues**

Fixes: #28438 

## **Manual testing steps**

1. Onboard with your SRP
2. Add accounts, rename accounts
3. Uninstall the extension
4. Reinstall and onboard with the previous SRP
5. Verify that your added & renamed accounts are there

## **Screenshots/Recordings**

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

### **Before**

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

### **After**

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## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
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
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [x] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [x] 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.

Author: mathieuartu

app/scripts/metamask-controller.js

@@ -157,7 +157,6 @@ import {
   NotificationServicesPushController,
   NotificationServicesController,
 } from '@metamask/notification-services-controller';
-import { isProduction } from '../../shared/modules/environment';
 import {
   methodsRequiringNetworkSwitch,
   methodsThatCanSwitchNetworkWithoutApproval,
@@ -1609,7 +1608,7 @@ export default class MetamaskController extends EventEmitter {
         },
       },
       env: {
-        isAccountSyncingEnabled: !isProduction() && isManifestV3,
+        isAccountSyncingEnabled: isManifestV3,
       },
       messenger: this.controllerMessenger.getRestricted({
         name: 'UserStorageController',