Updates `pubsub`  interop tests with  HTTP RPC wire format changes introduced in ipfs/js-ipfs#3922 and   ipfs/kubo#8183 and runs against the code from mentioned PRs (js-ipfs from ipfs/js-ipfs#3922 + go-ipfs 0.11.0-rc1) to ensure things work end-to-end.

Expands DHT tests.

Co-authored-by: achingbrain <alex@achingbrain.net>