Only filter post retrieval of entities for start nodes if working with entities that support start nodes #18287
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Prerequisites
Fixes: #18286
Description
As the issue notes, you can't retrieve any members via the "All members" view of the member picker (although you do get the paging information). This was due to some code looking to filter post retrieval into a paged model for user start nodes.
I've modified this so it only applies for documents and media, which are the only entities that support start nodes.
To Test: