Fix adding multiple interpolated expressions with the same format to admin logs

Add test case

Content.IntegrationTests/Tests/Administration/Logs/AddTests.cs

@@ -291,4 +291,49 @@ public class AddTests : ContentIntegrationTest
             json.Dispose();
         }
     }
+
+    [Test]
+    public async Task DuplicatePlayerDoesNotThrowTest()
+    {
+        var (client, server) = await StartConnectedServerClientPair(serverOptions: new ServerContentIntegrationOption
+        {
+            CVarOverrides =
+            {
+                [CCVars.AdminLogsQueueSendDelay.Name] = "0"
+            },
+        });
+
+        await Task.WhenAll(client.WaitIdleAsync(), server.WaitIdleAsync());
+
+        var sPlayers = server.ResolveDependency<IPlayerManager>();
+        var sSystems = server.ResolveDependency<IEntitySystemManager>();
+
+        var sAdminLogSystem = sSystems.GetEntitySystem<AdminLogSystem>();
+
+        var guid = Guid.NewGuid();
+
+        await server.WaitPost(() =>
+        {
+            var player = sPlayers.ServerSessions.Single();
+
+            sAdminLogSystem.Add(LogType.Unknown, $"{player} {player} test log: {guid}");
+        });
+
+        await WaitUntil(server, async () =>
+        {
+            var logs = await sAdminLogSystem.CurrentRoundLogs(new LogFilter
+            {
+                Search = guid.ToString()
+            });
+
+            if (logs.Count == 0)
+            {
+                return false;
+            }
+
+            return true;
+        });
+
+        Assert.Pass();
+    }
 }

Content.Shared/Administration/Logs/LogStringHandler.cs

@@ -40,7 +40,23 @@ public ref struct LogStringHandler
             format = argument[0] == '@' ? argument[1..] : argument;
         }
 
-        Values.Add(format, value);
+        if (!Values.TryAdd(format, value))
+        {
+            if (Values[format] == (object?) value)
+            {
+                return;
+            }
+
+            var originalFormat = format;
+            var i = 2;
+            format = $"{originalFormat}_{i}";
+
+            while (!Values.TryAdd(format, value))
+            {
+                format = $"{originalFormat}_{i}";
+                i++;
+            }
+        }
     }
 
     public void AppendLiteral(string value)