Set custom Doorkeeper classes in config
Follow-up from discussion at !107306 (comment 1213215918)
I originally added this method in the model rather than in config/initializers but realized upon manual testing of the refresh flow that Doorkeeper uses an instance of Doorkeeper::AccessToken so we needed to override the base class: https://github.com/doorkeeper-gem/doorkeeper/blob/47037da4def738e4cfd930bd433f35629a5869f6/lib/doorkeeper/request/refresh_token.rb#L9
It looks like we can override the model classes in config - see https://github.com/doorkeeper-gem/doorkeeper/blob/47037da4def738e4cfd930bd433f35629a5869f6/lib/doorkeeper/config.rb#L392. This might be something we should consider since we have our own classes.