refactor(client): document and test create types utilities (#42960)

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

client/utils/stateManagement.js

@@ -1,9 +0,0 @@
-export function createTypes(types = [], ns = 'annon') {
-  return types.reduce(
-    (types, action) => ({
-      ...types,
-      [action]: `${ns}.${action}`
-    }),
-    {}
-  );
-}