Refactor usage of roles to add support for delegated devices #13
Description
In case the devices are not added directly to MelCloud but are delegated from another owner, the fetch_energy_report and fetch_device_units methods may throw a 403 (Access Denied) error.
I propose a small refactor that would bypass these methods when such errors occur.
These errors should not affect the operation of other methods, since ATA units can still be fully controlled via the API.
Affected integration with HA: home-assistant/core#156618