GET CAR smoke-test with order=unk of UnixFS Directory

Implementation	bifrost-gateway	boxo	kubo
Conformance Version	main	main	main
Total	✅4	✅4	✅4
Body	✅1	✅1	✅1
Header Content-Type	✅2	✅2	✅2
Header Content-Type#01	✅1	✅1	✅1
Status code	✅1	✅1	✅1