Introduce data app pages (#25029)

* Add `is_app_page` to `Dashboard` type

* Add `dataAppPage` form to Dashboard entity

* Use "document" icon for app pages

* Add "Add new page" button

* Drop `isDataApp` dashboard prop

* Hide dashboard-only actions for pages

* Hide fullscreen mode button for pages

* Use "page" word in `DashboardHeader`

* Use "page" word for loading notification UI

* Use "page" word in empty state

* Use "page" word in `DashboardMoveModal`

* Use "page" word in `ArchiveDashboardModal`

* Fix public/embedded dashboard crash

* Fix type error

* Fix type error