[IMP] project: prevent sending of emails when duplicating project or task

After this commit:
- When duplicating project or task, assignment notifications and emails on stages are not sent

task-2849291

Part-of: odoo/odoo#91174

addons/project/models/project.py

@@ -610,7 +610,8 @@ class Project(models.Model):
             default = {}
         if not default.get('name'):
             default['name'] = _("%s (copy)") % (self.name)
-        project = super(Project, self).copy(default)
+        self_with_mail_context = self.with_context(mail_auto_subscribe_no_notify=True, mail_create_nosubscribe=True)
+        project = super(Project, self_with_mail_context).copy(default)
         for follower in self.message_follower_ids:
             project.message_subscribe(partner_ids=follower.partner_id.ids, subtype_ids=follower.subtype_ids.ids)
         if 'tasks' not in default:
@@ -1726,7 +1727,8 @@ class Task(models.Model):
             default['recurrence_id'] = self.recurrence_id.copy().id
         if self.allow_subtasks:
             default['child_ids'] = [child.copy({'name': child.name} if has_default_name else None).id for child in self.child_ids]
-        task_copy = super(Task, self).copy(default)
+        self_with_mail_context = self.with_context(mail_auto_subscribe_no_notify=True, mail_create_nosubscribe=True)
+        task_copy = super(Task, self_with_mail_context).copy(default)
         if self.allow_task_dependencies:
             task_mapping = self.env.context.get('task_mapping')
             task_mapping[self.id] = task_copy.id
@@ -2207,6 +2209,8 @@ class Task(models.Model):
 
     @api.model
     def _task_message_auto_subscribe_notify(self, users_per_task):
+        if self.env.context.get('mail_auto_subscribe_no_notify'):
+            return
         # Utility method to send assignation notification upon writing/creation.
         template_id = self.env['ir.model.data']._xmlid_to_res_id('project.project_message_user_assigned', raise_if_not_found=False)
         if not template_id: