request for a too long CID at example.com/ipfs/{CIDv1} returns human readable error (HTTP proxy tunneling via CONNECT)

Implementation	bifrost-gateway	boxo	kubo
Conformance Version	main	main	main
Total	✅4	✅4	✅4
Body	✅1	✅1	✅1
Status code	✅1	✅1	✅1