sessionmanagementscreen: support adding an authentication type selector

Harald Sitterrequested to merge
work/sitter/multiprompt into master
  • sessionmanagementscreen: support adding an authentication type selector

or really inject anything above the notificationsLabel :D

useful for letting the user select which auth type (face, smart card...) they want to use

Part of kde-linux/kde-linux#665

Edited by Harald Sitter

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