[FIX] sale_timesheet: let employees officers/project users access private tasks

Have a user U that is Project User, Timesheets User, Employeed Officer.
Give him access to a private task T (by adding U as a follower of T)
on private project P.
Because of Employeed Officer rights, view_task_form2_inherited is rendered.
This shows field is_project_map_empty, which computation depends on project_id.
If U does not have access to P, then this triggers an access error, so the Task
cannot be displayed.

It is in general a legitimate configuration to allow U to interact with T
without being given full access to P, since it works in all cases but the rights
described above.
Since the computation of is_project_map_empty is the only blocking point,
we put it in sudo.

opw 2031124

closes odoo/odoo#34676

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

addons/sale_timesheet/models/project.py

@@ -176,7 +176,7 @@ class ProjectTask(models.Model):
     @api.depends('project_id.sale_line_employee_ids')
     def _compute_is_project_map_empty(self):
         for task in self:
-            task.is_project_map_empty = not bool(task.project_id.sale_line_employee_ids)
+            task.is_project_map_empty = not bool(task.sudo().project_id.sale_line_employee_ids)
 
     @api.onchange('project_id')
     def _onchange_project(self):