HPC-10021: Show display form if articles have already been added, mark protected articles in selection preview, don't show protected articles publicly

[berliner]

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Statements:	22.35% ( 3353 / 15000 )
Methods:	24.37% ( 358 / 1469 )
Lines:	22.13% ( 2995 / 13531 )

[github-actions]

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Pusher: @berliner, Action: pull_request, Workflow: Run tests