fix: move useFeatureFlagOverride to routes instead of app router (#32685)

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## Description
Moving useFeatureFlagOverride from app router to ce routes to make sure
it is available for all environments.

Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/ok-to-test tags="@tag.MobileResponsive"

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/8690542934>
> Commit: 19cabc927d62cd0216fd37c5d2c1738937544a15
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=8690542934&attempt=1"
target="_blank">Click here!</a>

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Refactor**
- Improved the timing of feature flag checks by adjusting where they are
invoked in the application routing process.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/src/ce/AppRouter.tsx

@@ -73,6 +73,7 @@ export function Routes() {
   const user = useSelector(getCurrentUserSelector);
   const tenantPermissions = useSelector(getTenantPermissions);
   const isFeatureEnabled = useFeatureFlag(FEATURE_FLAG.license_gac_enabled);
+  useFeatureFlagOverride();
 
   return (
     <Switch>
@@ -150,7 +151,6 @@ export default function AppRouter() {
   const safeCrashCode: ERROR_CODES | undefined = useSelector(getSafeCrashCode);
   const isConsolidatedPageLoading = useSelector(getIsConsolidatedPageLoading);
   const dispatch = useDispatch();
-  useFeatureFlagOverride();
 
   useEffect(() => {
     dispatch(initCurrentPage());