Add a setting for a default editorial CC address that should be added to all article communications

Is your feature request related to a problem? Please describe.
Some journal editors would like to be added to all article-related communications through outgoing emails in the system.

Describe the solution you'd like
As a journal manager, I can configure a default CC email address that will be added to all emails. The default address is presented on the email form under the CC field and can be removed when desired.

Additional context
The journal requesting this feature operates under an open peer-review workflow, so there wouldn't be any concerns on betrayal of anonymity in their peer-review process. It might be important to warn users enabling this feature that it might be incompatible with flows such as triple-anonymous review

Start by tracing journal manager settings, the outgoing email form, and the code that sends article-related emails. Confirm where the default CC address should be configured and applied, including how users remove it and how anonymity-sensitive workflows are handled. Done means the setting appears in the form, is applied to relevant communications, and can be overridden when desired.