Remove need for machine to have a valid hostname in IdGenerator (#781)

### Summary & Motivation

The code in IdGenerator that finds an IP for the local machine
previously required the machine to have a valid hostname. This caused
issue if a valid hostname was not specified, a problem I ran into on a
new Mac.

This change iterates network interfaces instead of resolving the IP of
the computer hostname. It also improves the logic, in that it guarantees
that the resolved IP will never be a loopback address (such as
127.0.0.1).

### Checklist

- [x] I have added tests, or done manual regression tests
- [x] I have updated the documentation, if necessary

Author: tjementum

application/shared-kernel/SharedKernel/StronglyTypedIds/IdGenerator.cs

@@ -1,4 +1,4 @@
-using System.Net;
+using System.Net.NetworkInformation;
 using System.Net.Sockets;
 
 namespace PlatformPlatform.SharedKernel.StronglyTypedIds;
@@ -33,12 +33,28 @@ public static long NewId()
     /// </summary>
     private static int GetUniqueGeneratorIdFromIpAddress()
     {
-        var host = Dns.GetHostEntry(Dns.GetHostName());
         const string noNetworkAdapters = "No network adapters with an IPv4 address in the system. IdGenerator is meant to create unique IDs across multiple machines, and requires an IP address to do so.";
-        var ipAddress = Array.Find(host.AddressList, ip => ip.AddressFamily == AddressFamily.InterNetwork)
-                        ?? throw new InvalidOperationException(noNetworkAdapters);
 
-        var lastSegment = ipAddress.ToString().Split('.')[3];
-        return int.Parse(lastSegment);
+        var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces()
+            .Where(ni => ni.OperationalStatus == OperationalStatus.Up &&
+                         ni.NetworkInterfaceType != NetworkInterfaceType.Loopback &&
+                         ni.NetworkInterfaceType != NetworkInterfaceType.Tunnel
+            )
+            .ToArray();
+
+        foreach (var networkInterface in networkInterfaces)
+        {
+            var properties = networkInterface.GetIPProperties();
+            var ipv4Address = properties.UnicastAddresses
+                .FirstOrDefault(addr => addr.Address.AddressFamily == AddressFamily.InterNetwork);
+
+            if (ipv4Address is not null)
+            {
+                var lastSegment = ipv4Address.Address.ToString().Split('.')[3];
+                return int.Parse(lastSegment);
+            }
+        }
+
+        throw new InvalidOperationException(noNetworkAdapters);
     }
 }