Ensure requests are not cached with session data

Remove caching for CN special pages when a user is logged in.
This removes the possibility of a user being autologged in
to the infrastructure wiki and a caching server collecting the
Set-Header data.

Bug: 53032
Change-Id: I59001b82e49b65b035ddc60ed91687c4edefffad
Merge "Ensure requests are not cached with session data"