Use 'new' expression in places where the type is evident for content (#2590)

* Content.Client

* Content.Benchmarks

* Content.IntegrationTests

* Content.Server

* Content.Server.Database

* Content.Shared

* Content.Tests

* Merge fixes

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/GameObjects/EntitySystems/SharedPullingSystem.cs

@@ -23,7 +23,7 @@ namespace Content.Shared.GameObjects.EntitySystems
         ///     A mapping of pullers to the entity that they are pulling.
         /// </summary>
         private readonly Dictionary<IEntity, IEntity> _pullers =
-            new Dictionary<IEntity, IEntity>();
+            new();
 
         public override void Initialize()
         {