Add comprehensive test coverage for private content access control

Boris Doesborgrequested to merge
issue/private_content-2948622:2948622-improve-tests into 8.x-2.x
  • PrivateUnpublishedTest: Test unpublished private node access
  • PrivateContentTypeTest: Test all 4 content type privacy modes
  • PrivateListingTest: Test Views and entity query filtering
  • PrivatePermissionTest: Test view/edit/delete permission separation

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

Closes #2948622

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