Suppress SharedMapSystem info logs in tests (#40592)

* Supress informational `SharedMapSystem` logs in tests

* Why is the client like this

Content.IntegrationTests/Pair/TestPair.cs

@@ -27,6 +27,16 @@ public sealed partial class TestPair : RobustIntegrationTest.TestPair
 
     protected override async Task Initialize()
     {
+        await base.Initialize();
+
+        // Prevent info log spam in some tests (particularly SpawnAndDeleteAllEntitiesOnDifferentMaps)
+        Server.System<SharedMapSystem>().Log.Level = LogLevel.Warning;
+        Client.EntMan.EntitySysManager.SystemLoaded += (_, e) =>
+        {
+            if (e.System is SharedMapSystem map)
+                map.Log.Level = LogLevel.Warning;
+        };
+
         var settings = (PoolSettings)Settings;
         if (!settings.DummyTicker)
         {