refactor: remove some unused code

PluralKit.Core/Utils/TaskUtils.cs

@@ -1,39 +0,0 @@
-using System;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace PluralKit.Core
-{
-    public static class TaskUtils
-    {
-        public static async Task CatchException(this Task task, Action<Exception> handler)
-        {
-            try
-            {
-                await task;
-            }
-            catch (Exception e)
-            {
-                handler(e);
-            }
-        }
-
-        public static async Task<TResult> TimeoutAfter<TResult>(this Task<TResult> task, TimeSpan? timeout)
-        {
-            // https://stackoverflow.com/a/22078975
-            using (var timeoutCancellationTokenSource = new CancellationTokenSource())
-            {
-                var completedTask = await Task.WhenAny(task, Task.Delay(timeout ?? TimeSpan.FromMilliseconds(-1), timeoutCancellationTokenSource.Token));
-                if (completedTask == task)
-                {
-                    timeoutCancellationTokenSource.Cancel();
-                    return await task;  // Very important in order to propagate exceptions
-                }
-                else
-                {
-                    throw new TimeoutException();
-                }
-            }
-        }
-    }
-}