This change updates the rental product configurator so it continues to work with a recent internal code structure change. It helps maintain reliable product selection flows on eCommerce rental pages without changing the customer-facing experience.

The product_configurator_modal is now an ES6 module with a named export,
this commit adapts the corresponding import.

The account reporting engine was cleaned up by removing leftover development code that made the logic harder to understand and maintain. This reduces the risk of future mistakes in account report calculations without changing expected user-facing behavior.

Some code from a dev version of the engine was left in it. It was unclear and error-prone.