Don't filter on published state for media descendent queries

[AndyButland]

Prerequisites

• I have added steps to test this contribution in the description below

Fixes: #18211

Description

This PR should resolve the reported issue. On stepping through I could see we were filtering on published state, without first checking we are looking at an entity that can be published. So for documents it worked, but not for media.

To Test:

• See the code sample in the reported issue.
• Previously this would return just the root nodes, but with this update you should get all media.
• A similar query for content should continue to omit unpublished items.

[AndyButland]

Best to hold on this one @nikolajlauridsen actually... @kjac is going to do some rework on this area, so it makes sense that he considered this as part of that effort.