Add support for Dyson Pure HP04 purifying heater + fan (#34537)

* fix unnecesary checks

* change ClimateDevice to ClimateEntity

* Clean up

* Formatting

* Fix tests

* Clean tests

* Clean up tests

* Fix device mock

* Use safer patch target path

* Extract constant

* Remove not needed property

* Guard for missing target temperature

* Use async_mock mocks

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>