fix(code-snippet): update export pattern to include missing export

Author: joshblack

packages/react/src/components/CodeSnippet/index.js

@@ -5,5 +5,5 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-export * from './CodeSnippet.Skeleton';
+export { default as CodeSnippetSkeleton } from './CodeSnippet.Skeleton';
 export default from './CodeSnippet';