ACP2E-2025: Refix ACP2E-1445 for multiple store views in the frontend.

 - Fixed the integration test failure.

Author: devarul

app/code/Magento/Customer/ViewModel/Customer/Auth.php

@@ -27,9 +27,9 @@ public function __construct(
  /**
  * Check is user login
  *
- * @return bool
+ * @return bool|null
  */
- public function isLoggedIn(): bool
+ public function isLoggedIn(): bool|null
  {
  return $this->httpContext->getValue(Context::CONTEXT_AUTH);
  }