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.Server/GameObjects/Components/Body/Part/BodyPartComponent.cs

@@ -30,7 +30,7 @@ namespace Content.Server.GameObjects.Components.Body.Part
     [ComponentReference(typeof(IBodyPart))]
     public class BodyPartComponent : SharedBodyPartComponent, IAfterInteract
     {
-        private readonly Dictionary<int, object> _optionsCache = new Dictionary<int, object>();
+        private readonly Dictionary<int, object> _optionsCache = new();
         private IBody? _owningBodyCache;
         private int _idHash;
         private IEntity? _surgeonCache;