Type check all helpers (#25373)

* Type check all helpers, add inline exclusions for work in progress

* Remove unused Script._template_cache

* Add some missing type hints

* Remove unneeded type: ignore

* Type hint fixes

* Mypy assistance tweaks

* Don't look for None in deprecated config "at most once" check

* Avoid None name slugify attempt when generating entity id

* Avoid None state store attempt on entity remove

homeassistant/helpers/logging.py

@@ -3,6 +3,8 @@ import inspect
 import logging
 
 
+# mypy: allow-untyped-defs, no-check-untyped-defs
+
 class KeywordMessage:
     """
     Represents a logging message with keyword arguments.