fix: reintroduce backwards compatible assembly references to tools package (#1741)

Author: becksebenius-unity

com.unity.netcode.gameobjects/Runtime/com.unity.netcode.runtime.asmdef

@@ -2,6 +2,10 @@
     "name": "Unity.Netcode.Runtime",
     "rootNamespace": "Unity.Netcode",
     "references": [
+        "Unity.Multiplayer.MetricTypes",
+        "Unity.Multiplayer.NetStats",
+        "Unity.Multiplayer.NetStatsReporting",
+        "Unity.Multiplayer.NetworkSolutionInterface",
         "Unity.Multiplayer.Tools.MetricTypes",
         "Unity.Multiplayer.Tools.NetStats",
         "Unity.Multiplayer.Tools.NetStatsReporting",