Werk #12991: Previsualization of views/dashboard/reports by admins

Between werks 12871 and 12487 there was a feature competition. Users with permission "Edit foreign (views/dashboards/reports)" (mostly admins) must be able to edit and thus preview all those pages. However under normal use of checkmk, the working user(also admin) wants to use/work with the page of highest priority, which must be restricted to only pages that the user owns or are published for all users.

Werk 12487 allowed admins to preview everything, but under normal operation, views from other users would become their active working view. Werk 12871 fixed that bringing the priority back, yet breaking the posibility to preview everything from the editor. This werk brings both behaviors to work together.

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