Support Huawei LTE SSDP discovery (#28214)

* Support Huawei LTE SSDP discovery

* Avoid KeyError on simultaneous user initiated flow

Co-Authored-By: Paulus Schoutsen <paulus@home-assistant.io>

* Format code

* Add already configured check

* Initialize context in test flows

* Move deviceType match to manifest

* Update generated.ssdp

* Add SSDP config flow test case

* Remove stale debug print from tests