Missing permission handling for fileItem entities

Problem/Motivation

When fetching preview fileItem entities stored in in azure blob storage, GraphQL returns null, even if all permissions are given.
This is likely the result of a missing access_entity hook implementation.
Further details can be found in the reporduction repository README.md.

Steps to reproduce

Checkout reproduction repository and follow README.md file.

Proposed resolution

NA

Remaining tasks

Unknown

User interface changes

Unknown

API changes

Unknown

Data model changes

Unknown