[Ryujinx.Graphics.Vic] Address dotnet-format issues (#5374)

* dotnet format style --severity info

Some changes were manually reverted.

* Restore a few unused methods and variables

* Address review comments

* Address most dotnet format whitespace warnings

* Add comments to disabled warnings

* Address IDE0251 warnings

* dotnet format whitespace after rebase

* Remove SuppressMessage attribute for removed rule

src/Ryujinx.Graphics.Vic/Image/BufferPool.cs

@@ -34,7 +34,7 @@ namespace Ryujinx.Graphics.Vic.Image
         {
             int index = RentMinimum(length, out T[] bufferArray);
 
-            buffer = new Span<T>(bufferArray).Slice(0, length);
+            buffer = new Span<T>(bufferArray)[..length];
 
             return index;
         }