Remove unused legacy state translations (#112023)

* Remove unused state translations

There have been replaced with entity translations
https://github.com/home-assistant/developers.home-assistant/pull/1557
https://github.com/home-assistant/core/pull/82701

* nothing does merging anymore

* useless dispatch

* remove

* remove platform code from hassfest

* preen

* Update homeassistant/helpers/translation.py

* ruff

* fix merge

* check is impossible now since we already know if translations exist or not

* keep the function for now

* remove unreachable code since we filter out `.` before now

* reduce

* reduce

* fix merge conflict (again)