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Allow extensions to add a banner to UserLogin and CreateAccount special pages

Authored by Florian.

Description

Allow extensions to add a banner to UserLogin and CreateAccount special pages

Some extensions, e.g. MobileFrontend, customize the UserLogin and UserCreate
special pages. This change adds the possibility to add some HTML after the warning
and/or error messages are printed to the output. This will be used in
MobileFrontend to get rid of the own userlogin template.

Bug: T87261
Change-Id: Ia81f7c52f08e8dcc73ac751432560c4077d4bd39