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
Xavier BOL (xbo)
adf3aca403