Remove internal NetworkDriver accessor

Author: simon-lemay-unity

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -421,7 +421,6 @@ private struct PacketLossCache
 
         internal static event Action<int, NetworkDriver> TransportInitialized;
         internal static event Action<int> TransportDisposed;
-        internal NetworkDriver NetworkDriver => m_Driver;
 
         /// <summary>
         /// Provides access to the <see cref="Networking.Transport.NetworkDriver"/> for this <see cref="UnityTransport"/> instance.
@@ -501,7 +500,7 @@ private void InitDriver()
                 out m_UnreliableSequencedFragmentedPipeline,
                 out m_ReliableSequencedPipeline);
 
-            TransportInitialized?.Invoke(GetInstanceID(), NetworkDriver);
+            TransportInitialized?.Invoke(GetInstanceID(), m_Driver);
         }
 
         private void DisposeInternals()

com.unity.netcode.gameobjects/Tests/Editor/Transports/UnityTransportTests.cs

@@ -189,7 +189,7 @@ public void UnityTransport_EmptySecurityStringsShouldThrow([Values("", null)] st
                     networkManager.StartServer();
                 });
                 // Make sure StartServer failed
-                Assert.False(transport.NetworkDriver.IsCreated);
+                Assert.False(transport.GetNetworkDriver().IsCreated);
                 Assert.False(networkManager.IsServer);
                 Assert.False(networkManager.IsListening);
             }

com.unity.netcode.gameobjects/Tests/Runtime/Metrics/PacketLossMetricsTests.cs

@@ -64,9 +64,9 @@ public IEnumerator TrackPacketLossAsClient()
             var clientNetworkManager = m_ClientNetworkManagers[0];
 
             var clientTransport = (UnityTransport)clientNetworkManager.NetworkConfig.NetworkTransport;
-            clientTransport.NetworkDriver.CurrentSettings.TryGet<SimulatorUtility.Parameters>(out var parameters);
+            clientTransport.GetNetworkDriver().CurrentSettings.TryGet<SimulatorUtility.Parameters>(out var parameters);
             parameters.PacketDropPercentage = m_PacketLossRate;
-            clientTransport.NetworkDriver.ModifySimulatorStageParameters(parameters);
+            clientTransport.GetNetworkDriver().ModifySimulatorStageParameters(parameters);
 
             var waitForPacketLossMetric = new WaitForGaugeMetricValues((clientNetworkManager.NetworkMetrics as NetworkMetrics).Dispatcher,
                 NetworkMetricTypes.PacketLoss,