See https://github.com/ooni/probe/issues/1754 for a comprehensive description.
https://github.com/ooni/probe-cli/pull/421 was wrong because we need a more rich interface for quic-go to call ReadMsgUDP. With this commit, we use such an interface: OOBCapablePacketConn. Still part of https://github.com/ooni/probe/issues/1505.
* refactor: cleaner way of passing a UDPConn around Also part of https://github.com/ooni/probe/issues/1505 * Update internal/engine/netx/quicdialer/connectionstate.go