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

connection/quic_connection_test.go

@@ -530,7 +530,7 @@ func TestServeUDPSession(t *testing.T) {
 	ctx, cancel := context.WithCancel(t.Context())
 
 	// Establish QUIC connection with edge
-	edgeQUICSessionChan := make(chan quic.Connection)
+	edgeQUICSessionChan := make(chan *quic.Conn)
 	go func() {
 		earlyListener, err := quic.Listen(udpListener, testTLSServerConfig, testQUICConfig)
 		assert.NoError(t, err)
@@ -779,7 +779,7 @@ func TestDialQuicWithSkipPortReuse(t *testing.T) {
 	<-serverDone
 }
 
-func serveSession(ctx context.Context, datagramConn *datagramV2Connection, edgeQUICSession quic.Connection, closeType closeReason, expectedReason string, t *testing.T) {
+func serveSession(ctx context.Context, datagramConn *datagramV2Connection, edgeQUICSession cfdquic.QUICConnection, closeType closeReason, expectedReason string, t *testing.T) {
 	payload := []byte(t.Name())
 	sessionID := uuid.New()
 	cfdConn, originConn := net.Pipe()
@@ -843,7 +843,7 @@ const (
 	closedByTimeout
 )
 
-func runRPCServer(ctx context.Context, session quic.Connection, sessionRPCServer pogs.SessionManager, configRPCServer pogs.ConfigurationManager, t *testing.T) {
+func runRPCServer(ctx context.Context, session cfdquic.QUICConnection, sessionRPCServer pogs.SessionManager, configRPCServer pogs.ConfigurationManager, t *testing.T) {
 	stream, err := session.AcceptStream(ctx)
 	require.NoError(t, err)