[FIX] project: use task in sudo for classic portal task view

Before this commit, when the portal user has access to a project and a
task has a customer who is not in the same company than the portal user,
the portal user has a AccessError when he wants to consult this task.

This commit uses the task in sudo to have the same information shown in
/my/task/<id of the task>.

Steps to reproduce:
------------------
1. Share in readonly mode a project to the portal user (with
visibility set to 'portal')
2. Create a task in this project and set a Customer A (a customer who
has not the same company than the portal user).
3. Log in as portal user (Joel Willis).
4. Go to '/my/projects' and select the project shared.
5. Select the task created.

Actual Behaviour:
----------------
AccessError exception is displayed because the portal user has no access
to partner in other company than his yours.

Expected Behaviour:
------------------
Display the task portal form view like the one shown in /my/task/<id of
the task created>.

task-2633229

closes #77156

X-original-commit: 3b0d6d0cef73baa5b5f235c3518c8bd698c81e21

addons/project/controllers/portal.py

@@ -210,9 +210,9 @@ class ProjectCustomerPortal(CustomerPortal):
         Task = request.env['project.task']
         if access_token:
             Task = Task.sudo()
-        task = Task.search([('project_id', '=', project_id), ('id', '=', task_id)], limit=1)
-        task.sudo().attachment_ids.generate_access_token()
-        values = self._task_get_page_view_values(task, access_token, project=project_sudo, **kw)
+        task_sudo = Task.search([('project_id', '=', project_id), ('id', '=', task_id)], limit=1).sudo()
+        task_sudo.attachment_ids.generate_access_token()
+        values = self._task_get_page_view_values(task_sudo, access_token, project=project_sudo, **kw)
         values['project'] = project_sudo
         return request.render("project.portal_my_task", values)