Before this commit, when the internal user is not follower of the
project and enter in the project sharing feature. If he wants to see the
form view of a task, he cannot and have a Session expired error.
This issue arrives because in the chatter we check is the user is a
follower of the project shared.
This commit fixes this issue by just using the _document_check_access
method to check if the user can access to the document. Indeed, we don't
need to check if user is a follower because the _document_check_access
does it with the `ir.rules`.
Related PR: #73341
Part of task-2633229
closes#76098