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/Database/ServerDbSqlite.cs

@@ -23,7 +23,7 @@ namespace Content.Server.Database
         // For SQLite we use a single DB context via SQLite.
         // This doesn't allow concurrent access so that's what the semaphore is for.
         // That said, this is bloody SQLite, I don't even think EFCore bothers to truly async it.
-        private readonly SemaphoreSlim _prefsSemaphore = new SemaphoreSlim(1, 1);
+        private readonly SemaphoreSlim _prefsSemaphore = new(1, 1);
 
         private readonly Task _dbReadyTask;
         private readonly SqliteServerDbContext _prefsCtx;