Remove eventlisterner guard

It appears it was only used for an old bug and it makes this class harder to read and understand.

Author: marcpopMSFT

test/HelixTasks/AssemblyScheduler.cs

@@ -35,15 +35,6 @@ public AssemblyPartitionInfo(string assemblyPath)
 
     public sealed class AssemblyScheduler
     {
-        /// <summary>
-        /// This is a test class inserted into assemblies to guard against a .NET desktop bug.  The tests
-        /// inside of it counteract the underlying issue.  If this test is included in any assembly it 
-        /// must be added to every partition to ensure the work around is present
-        /// 
-        /// https://github.com/dotnet/corefx/issues/3793
-        /// https://github.com/dotnet/roslyn/issues/8936
-        /// </summary>
-        private const string EventListenerGuardFullName = "Microsoft.CodeAnalysis.UnitTests.EventListenerGuard";
 
         private readonly struct TypeInfo
         {
@@ -78,23 +69,20 @@ private sealed class AssemblyInfoBuilder
             private readonly StringBuilder _builder = new();
             private readonly string _assemblyPath;
             private readonly int _methodLimit;
-            private readonly bool _hasEventListenerGuard;
             private readonly bool _netFramework;
             private int _currentId;
             private List<TypeInfo> _currentTypeInfoList = new();
 
-            private AssemblyInfoBuilder(string assemblyPath, int methodLimit, bool hasEventListenerGuard, bool netFramework = false)
+            private AssemblyInfoBuilder(string assemblyPath, int methodLimit, bool netFramework = false)
             {
                 _assemblyPath = assemblyPath;
                 _methodLimit = methodLimit;
-                _hasEventListenerGuard = hasEventListenerGuard;
                 _netFramework = netFramework;
             }
 
             internal static void Build(string assemblyPath, int methodLimit, List<TypeInfo> typeInfoList, out List<Partition> partitionList, out List<AssemblyPartitionInfo> assemblyInfoList, bool netFramework = false)
             {
-                var hasEventListenerGuard = typeInfoList.Any(x => x.FullName == EventListenerGuardFullName);
-                var builder = new AssemblyInfoBuilder(assemblyPath, methodLimit, hasEventListenerGuard, netFramework);
+                var builder = new AssemblyInfoBuilder(assemblyPath, methodLimit, netFramework);
                 builder.Build(typeInfoList);
                 partitionList = builder._partitionList;
                 assemblyInfoList = builder._assemblyInfoList;
@@ -131,12 +119,6 @@ private void BeginPartition()
                 _currentId++;
                 _currentTypeInfoList = new List<TypeInfo>();
                 _builder.Length = 0;
-
-                // Ensure the EventListenerGuard is in every partition.
-                if (_hasEventListenerGuard)
-                {
-                    _builder.Append($@"-class ""{EventListenerGuardFullName}"" ");
-                }
             }
 
             private void CheckForPartitionLimit(bool done)