* add sensor platform to backup integration
* adjust namings, remove system integration flag
* add first simple test
* apply review comments
* fix test
* add sensor tests
* adjustements to use backup helper
* remove obsolet async_get_manager from init
* unsubscribe from events on entry unload
* add configuration_url
* fix doc string
* fix sensor tests
* mark async_unsubscribe as callback
* set integration_type service
* extend sensor test
* set integration_type on correct integration :)
* fix after online conflict resolution
* add sensor update tests
* simplify the sensor update tests
* avoid io during tests
* Add comment
---------
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
