When scheduling plans on employees, activities may be assigned to people who
don't have access to the record. It was managed locally in HR through a dummy
model aggregating activities. However, it was removed and we replace it here by
a generic solution that adds an entry in the systray: "Other activities". When
clicking on that entry, it displays a list view of the activities assigned to
the user for which he has no access to the related record. Those activities
were not visible to the user before.
Technical note: to allow displaying such records, we have modified the custom
acl defined in python to allow users to read activities assigned to them even
if they don't have access to the related record.
Task-3562098
Part-of: odoo/odoo#139917
Pierre-Yves Dufays
54aaf3a0a5