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This is part of: plone/volto#5284
The container for the Plone Site working copy is Plone Site itself.
To avoid permission errors, the Plone Site working copy is created as the Document type. But right after the Document is created, its portal_type is changed to "Plone Site", so that the schema of the working copy is the same as the Plone Site schema.
Prevents Plone Site permissions from being changed on checkin.
The working copy of Plone Site is created in Plone Site itself. So at checkout, we should check if the user has permission to add content in Plone Site, instead of its parent.