GeoNet NZ Volcanic Alert Level sensor (#26901)

* first version of new integration

* moved icon to shared consts

* added unit tests

* transformed from geolocation to sensor integration

* alert level is now the state of the sensor

* adopted unit tests

* fixed comment

* keep all sensors registered even if the feed update fails intermittently

* bumped version of upstream library

* bumped version of integration library

* regenerated requirements

* bumped version of integration library

* bumped version of integration library

* fixed generated file

* removed commented out code

* regenerated config flow file

* update to latest integration library version

* simplified code

* removed debug log statement

* simplified code structure

* defined constant

* use core interfaces

* moved test and fixture

* sorted imports

* simplified patching

* moved fixture to central config file