[Security] Fix the retrieval of the last username when using forwarding #19334
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When using forwarding to render the login page (which is not the default), the info are stored in the subrequest attributes rather than the session.
getLastAuthenticationError
was handling this properly butgetLastUsername
was not checking the attributes.This fixes it by checking the attributes (I'm checking them before the session, to be consistent with
getLastAuthenticationError
)