[IMP] project: add sudo in project.task write dict comprehension

All write operations on the `project.task` model are slowed down significantly
by a dict comprehension mapping tasks to their user_ids because of the access
rules checks. By adding a sudo to that dict comprehension, this commit makes it
bypass those checks and speeds it up.

Task-3164004

closes odoo/odoo#115037

Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>

addons/project/models/project_task.py

@@ -1027,7 +1027,7 @@ class Task(models.Model):
             self = self.sudo()
 
         # Track user_ids to send assignment notifications
-        old_user_ids = {t: t.user_ids for t in self}
+        old_user_ids = {t: t.user_ids for t in self.sudo()}
 
         if "personal_stage_type_id" in vals and not vals['personal_stage_type_id']:
             del vals['personal_stage_type_id']