Fix loading Customer Center when entitlement is granted by another Apple app

[vegaro]

Projects with multiple apps fail to load when the entitlement is granted by another app in the project. For example this Customer Info response:

{
  "request_date": "2024-12-17T13:47:05Z",
  "request_date_ms": 1734443225832,
  "subscriber": {
    "entitlements": {
      "pro": {
        "expires_date": "2024-12-17T14:01:33Z",
        "grace_period_expires_date": null,
        "product_identifier": "premiumyearly",
        "purchase_date": "2024-12-16T14:01:33Z"
      }
    },
    "first_seen": "2024-04-29T06:37:25Z",
    "last_seen": "2024-12-16T15:24:53Z",
    "management_url": "https://apps.apple.com/account/subscriptions",
    "non_subscriptions": {
    },
    "original_app_user_id": "_",
    "original_application_version": "1.0",
    "original_purchase_date": "2019-05-09T08:20:34Z",
    "other_purchases": {
    },
    "subscriptions": {
      "premiumyearly": {
        "auto_resume_date": null,
        "billing_issues_detected_at": null,
        "expires_date": "2024-12-17T14:01:33Z",
        "grace_period_expires_date": null,
        "is_sandbox": true,
        "original_purchase_date": "2024-02-16T14:02:22Z",
        "ownership_type": "PURCHASED",
        "period_type": "normal",
        "purchase_date": "2024-12-16T14:01:33Z",
        "refunded_at": null,
        "store": "app_store",
        "store_transaction_id": "000",
        "unsubscribe_detected_at": null
      }
    }
  }
}

This also fixes the Customer Center when the product fails to load by displaying the available information.

[fire-at-will]

Nice!!