[FIX] project: remove "I take it" from task following email header

Current behaviour:
On a brand new task with no assignees, when we add an user to follow
the task with an email, there is a link "I take it" that is supposed
to assign the newly following user as the assignee of the task. This
link is dead, returning a 404.

Expected behaviour:
Either correct the link, or remove it from the email header.

Steps to reproduce:
- Install Project
- Create a task, with no assignees
- Add a new follower to the task with Send Email checked.
- Check the outgoing email, and click on the link "I take it".
- 404 response

Reason for the problem:
The route which we were using for this `/mail/assign` doesn't exist
anymore since version 15. This was an intended design change, to
remove noice. The user can click on "See task" and assign himself on
there.

Fix:
Remove the "I take it" link from the email header.

Affected versions:
- 15.0
- saas-15.2
- 16.0
- saas-16.1
- saas-16.2
- master

opw-3276036

closes odoo/odoo#119920

X-original-commit: 2d3134381c23675199bd8e14fafb1804d54339e6
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>
Signed-off-by: Piryns Victor (pivi) <pivi@odoo.com>

addons/project/i18n/project.pot

@@ -2265,12 +2265,6 @@ msgstr ""
 msgid "How’s this project going?"
 msgstr ""
 
-#. module: project
-#. odoo-python
-#: code:addons/project/models/project.py:0
-#, python-format
-msgid "I take it"
-msgstr ""
 
 #. module: project
 #: model:ir.model.fields,field_description:project.field_project_collaborator__id

addons/project/models/project_task.py

@@ -1222,15 +1222,10 @@ class Task(models.Model):
         if not self:
             return groups
 
-        local_msg_vals = dict(msg_vals or {})
         self.ensure_one()
 
         project_user_group_id = self.env.ref('project.group_project_user').id
         new_group = ('group_project_user', lambda pdata: pdata['type'] == 'user' and project_user_group_id in pdata['groups'], {})
-        if not self.user_ids and not self.is_closed:
-            take_action = self._notify_get_action_link('assign', **local_msg_vals)
-            project_actions = [{'url': take_action, 'title': _('Assign to me')}]
-            new_group[2]['actions'] = project_actions
         groups = [new_group] + groups
 
         if self.project_privacy_visibility == 'portal':