The presence indicator support used by Documents has been moved into the messaging layer so it can be shared and maintained more consistently. This is mainly an internal restructuring that should preserve existing user behavior while preparing related platform updates.

preparation for PR: https://github.com/odoo/odoo/pull/171220

community PR: https://github.com/odoo/odoo/pull/177611
upgrade PR: https://github.com/odoo/upgrade/pull/6460