Suppress the redlink drawer for User namespace pages. The redlink drawer
prompts the user to create a missing page but this hinders the usual
workflow for User page visits specifically. A User page is connection to
an account's contributions, age, and other activities and encouraging
the creation of a missing User page when trying to view these
connections is a hindrance, especially if the missing User page is not
associated with the current user.
Bug: T201339
Change-Id: I784493a8ecf28176b5a393cb52d7bfa9fa9b1309
