Verify receipt of connection_close in quic_client_interop This CL also changes QuicFramer::MaybeExtractQuicErrorCode to map NO_IETF_QUIC_ERROR to QUIC_NO_ERROR. gfe-relnote: change mapping of NO_IETF_QUIC_ERROR, not flag-protected PiperOrigin-RevId: 274704993 Change-Id: If3e7f98dd6a2435a477ee318b44fce78e6ab6e30