community[patch]: Fix remaining __inits__ in community (#22037)

Fixes the __init__ files in community to use __all__ which is statically
defined.

libs/community/langchain_community/document_transformers/__init__.py

@@ -93,6 +93,3 @@ def __getattr__(name: str) -> Any:
         module = importlib.import_module(_module_lookup[name])
         return getattr(module, name)
     raise AttributeError(f"module {__name__} has no attribute {name}")
-
-
-__all__ = list(_module_lookup.keys())