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/Components/Chemistry/SharedSolutionContainerComponent.cs

@@ -15,7 +15,7 @@ namespace Content.Shared.GameObjects.Components.Chemistry
         /// <inheritdoc />
         public sealed override uint? NetID => ContentNetIDs.SOLUTION;
 
-        private Solution _solution = new Solution();
+        private Solution _solution = new();
         private ReagentUnit _maxVolume;
         private Color _substanceColor;