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.Client/GameObjects/Components/LightBehaviourComponent.cs

@@ -361,7 +361,7 @@ namespace Content.Client.GameObjects.Components
         }
 
         [ViewVariables(VVAccess.ReadOnly)]
-        private readonly List<AnimationContainer> _animations = new List<AnimationContainer>();
+        private readonly List<AnimationContainer> _animations = new();
 
         private float _originalRadius = default;
         private float _originalEnergy = default;