Issue3365 add production

Adds production entry to `message_broker_producer` to support triggering a transaction message being sent to Message Broker when a user updates their profile settings. The message will be distributed the following queues:
- userAPIProfileQueue: Consumer will update the user document in `mb-user`
- userProfileMailchimpQueue: Consumer will update Mailchimp with any change to the user email subscription preference.

**To Test**
- `ds build` - this should include a fresh copy of the `messagebroker-config` repo with an update mb_config.json file.
- `ds pull stage`
- `drush updb`
- Confirm the new production entry `transactional_user_profile_update` with the `userAPIProfileQueue` and `userProfileMailchimpQueue` assigned to the `tranactionalExchange`.