TUN-10557: Bump quic-go v0.59.1

Bumps quic-go to v0.59.1 (chungthuang fork rebased from upstream v0.45 onto
v0.59.1). Upstream removed the `logging` package and replaced its
callback-based ConnectionTracer with the structured `qlog`/`qlogwriter` event
API, which required migrating cloudflared's QUIC metrics collection.

Migrations:

- quic/tracing.go: connTracer no longer fills a logging.ConnectionTracer
  callback struct. It implements qlogwriter.Trace + qlogwriter.Recorder and
  dispatches qlog events (PacketSent, PacketReceived, MetricsUpdated, ...) to
  the collector through RecordEvent. NewClientTracer now returns a function
  compatible with quic.Config.Tracer.

- quic/metrics.go: collector methods take qlog types (qlog.Frame,
  qlog.PacketType, qlog.MetricsUpdated, ...) and plain int64 in place of the
  removed logging.ByteCount/Frame/RTTStats/TransportParameters.

- quic/conversion.go: PacketType, PacketDropReason and PacketLossReason are
  strings upstream rather than numeric iotas, so the converters become
  pass-through allowlists. CongestionState is also a string;
  congestionStateToFloat maps it back to the numeric gauge values cloudflared
  exports.

- quic.Connection/quic.Stream became *quic.Conn/*quic.Stream; updated
  ConnWithCloser, SafeStreamCloser and the connection package accordingly.
  Tests and generated mocks (mocks/mock_quic_connection.go) were adapted to
  the new pointer-based API.

Closes TUN-10557

prechecks/probes_test.go

@@ -7,7 +7,6 @@ import (
 	"net"
 	"testing"
 
-	"github.com/quic-go/quic-go"
 	"github.com/rs/zerolog"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -33,67 +32,6 @@ const (
 // perform a real TLS handshake, so an empty config is sufficient.
 var testTLSConfig = &tls.Config{} //nolint:gosec
 
-// mockQuicConnection is a minimal test double for quic.Connection.
-type mockQuicConnection struct {
-	closeErr error
-}
-
-func (m *mockQuicConnection) AcceptStream(_ context.Context) (quic.Stream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) AcceptUniStream(_ context.Context) (quic.ReceiveStream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) OpenStream() (quic.Stream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) OpenStreamSync(_ context.Context) (quic.Stream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) OpenUniStream() (quic.SendStream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) OpenUniStreamSync(_ context.Context) (quic.SendStream, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) LocalAddr() net.Addr {
-	return nil
-}
-
-func (m *mockQuicConnection) RemoteAddr() net.Addr {
-	return nil
-}
-
-func (m *mockQuicConnection) CloseWithError(_ quic.ApplicationErrorCode, _ string) error {
-	return m.closeErr
-}
-
-func (m *mockQuicConnection) Context() context.Context {
-	return context.Background()
-}
-
-func (m *mockQuicConnection) ConnectionState() quic.ConnectionState {
-	return quic.ConnectionState{}
-}
-
-func (m *mockQuicConnection) SendDatagram(_ []byte) error {
-	return nil
-}
-
-func (m *mockQuicConnection) ReceiveDatagram(_ context.Context) ([]byte, error) {
-	return nil, nil
-}
-
-func (m *mockQuicConnection) AddPath(*quic.Transport) (*quic.Path, error) {
-	return nil, nil
-}
-
 // Helper to create test edge addresses.
 func createTestEdgeAddr(ip string, port int, version allregions.EdgeIPVersion) *allregions.EdgeAddr {
 	parsedIP := net.ParseIP(ip)
@@ -225,9 +163,10 @@ func TestProbeQUIC_Success(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
-	mockConn := &mockQuicConnection{}
+	successfulQUICConn := mocks.NewMockQUICConnection(ctrl)
+	successfulQUICConn.EXPECT().CloseWithError(gomock.Any(), gomock.Any()).Return(nil)
 	dialer := mocks.NewMockQUICDialer(ctrl)
-	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(mockConn, nil)
+	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(successfulQUICConn, nil)
 
 	addr := createTestEdgeAddr("192.0.2.1", testEdgePort, allregions.V4)
 	logger := zerolog.New(nil)
@@ -263,9 +202,12 @@ func TestProbeQUIC_CloseErrorDoesNotAffectResult(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
 
-	mockConn := &mockQuicConnection{closeErr: errors.New("close failed")}
+	// Return a mock whose CloseWithError returns an error — probeQUIC must still
+	// report Pass because the handshake itself succeeded.
+	fakeQUICConn := mocks.NewMockQUICConnection(ctrl)
+	fakeQUICConn.EXPECT().CloseWithError(gomock.Any(), gomock.Any()).Return(errors.New("close failed"))
 	dialer := mocks.NewMockQUICDialer(ctrl)
-	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(mockConn, nil)
+	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(fakeQUICConn, nil)
 
 	addr := createTestEdgeAddr("192.0.2.1", testEdgePort, allregions.V4)
 	logger := zerolog.New(nil)
@@ -505,10 +447,11 @@ func TestProbeQUIC_IPv6Address(t *testing.T) {
 	t.Parallel()
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()
+	successfulQUICConn := mocks.NewMockQUICConnection(ctrl)
+	successfulQUICConn.EXPECT().CloseWithError(gomock.Any(), gomock.Any()).Return(nil)
 
-	mockConn := &mockQuicConnection{}
 	dialer := mocks.NewMockQUICDialer(ctrl)
-	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(mockConn, nil)
+	dialer.EXPECT().DialQuic(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Return(successfulQUICConn, nil)
 
 	addr := createTestEdgeAddr("2001:db8::1", testEdgePort, allregions.V6)
 	logger := zerolog.New(nil)