Change trigger platform key to trigger (#124357)

* fix

* Fix

* Fix

* Update homeassistant/helpers/config_validation.py

Co-authored-by: Erik Montnemery <erik@montnemery.com>

* Fix

* Fix

* Fix

* Fix

* Add more tests

* Fix

* Fix tests

* Add tests

* Let's see what the CI does

* It fails on the code that tested the thing ofc

* It fails on the code that tested the thing ofc

* Revert test thingy

* Now the test works again, lovely

* Another one

* Fix websocket thingy

* Only copy when needed

* Improve comment

* Remove test

* Fix docstring

* I think this now also work since this transforms trigger to platform

* Add comment

* Update homeassistant/helpers/config_validation.py

Co-authored-by: Erik Montnemery <erik@montnemery.com>

* Update homeassistant/helpers/config_validation.py

Co-authored-by: Erik Montnemery <erik@montnemery.com>

* Update homeassistant/helpers/config_validation.py

Co-authored-by: Erik Montnemery <erik@montnemery.com>

* Check for mapping

* Add test

* Update homeassistant/helpers/config_validation.py

Co-authored-by: Erik Montnemery <erik@montnemery.com>

* Update test to also test for trigger keys

---------

Co-authored-by: Erik Montnemery <erik@montnemery.com>

tests/components/automation/test_recorder.py

@@ -39,7 +39,7 @@ async def test_exclude_attributes(
         automation.DOMAIN,
         {
             automation.DOMAIN: {
-                "trigger": {"platform": "event", "event_type": "test_event"},
+                "trigger": {"trigger": "event", "event_type": "test_event"},
                 "actions": {"action": "test.automation", "entity_id": "hello.world"},
             }
         },