Delete EtwLoggingTests because the test is flawed (#33097)

src/Workspaces/CoreTest/UtilityTest/EtwLoggingTests.cs

-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
-
-using System;
-using System.Threading;
-using Microsoft.CodeAnalysis.Internal.Log;
-using Roslyn.Test.Utilities;
-using Xunit;
-
-namespace Microsoft.CodeAnalysis.UnitTests
-{
-    public class LoggingTests : TestBase
-    {
-        [Fact]
-        public void TestAllocationPooling()
-        {
-            Logger.SetLogger(AggregateLogger.Create(TestLogger.Instance, Logger.GetLogger()));
-
-            var block1 = LogBlock();
-            var block2 = LogBlock();
-            Assert.NotEqual(block1, block2);
-
-            block1.Dispose();
-            var block3 = LogBlock();
-            Assert.Same(block1, block3);
-
-            block2.Dispose();
-            block3.Dispose();
-        }
-
-        private static IDisposable LogBlock()
-        {
-            return Logger.LogBlock(FunctionId.TestEvent_NotUsed, CancellationToken.None);
-        }
-
-        private class TestLogger : ILogger
-        {
-            public static readonly ILogger Instance = new TestLogger();
-
-            public bool IsEnabled(FunctionId functionId)
-            {
-                return true;
-            }
-
-            public void Log(FunctionId functionId, LogMessage logMessage) { }
-            public void LogBlockStart(FunctionId functionId, LogMessage logMessage, int uniquePairId, CancellationToken cancellationToken) { }
-            public void LogBlockEnd(FunctionId functionId, LogMessage logMessage, int uniquePairId, int delta, CancellationToken cancellationToken) { }
-        }
-    }
-}