Feature: #94210 - Information about inherited backend layout

See forge#94210

Description

When editing a page record, the field pages.backend_layout_next_level can be used to apply a backend layout to all subpages.

This can make it difficult for the editor to determine the currently applied backend layout. To help the editor in case of an inherited layout a message is now displayed below the pages.backend_layout field label via a new FormEngine field information.