Content of drupalSettings.bestreply not up-to-date

@nico.b - I did not fully test these changes before merging them in as I should have. However, in performing full testing, the cache tag itself doesn't get invalidated when newer comments are added. The solution for this is to use the existing node cache and invalidate that whenever a bestreply gets marked or cleared.

Thank you for discovering the issue, I have credited you for this.