Add style and story for generic chat action message

web/components/chat/ChatActionMessage.tsx

@@ -1,11 +0,0 @@
-/* eslint-disable react/no-danger */
-interface Props {
-  body: string;
-}
-
-// eslint-disable-next-line @typescript-eslint/no-unused-vars
-export default function ChatActionMessage(props: Props) {
-  const { body } = props;
-
-  return <div dangerouslySetInnerHTML={{ __html: body }} />;
-}