Cleanup CodeAnalysis suppression for GC.Collect (#11814)

Co-authored-by: Tomas Bartonek <[email protected]>

Author: Erarndt

src/Build/BackEnd/Node/OutOfProcNode.cs

@@ -5,7 +5,6 @@
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.IO;
 using System.Threading;
@@ -542,7 +541,6 @@ private NodeEngineShutdownReason HandleShutdown(out Exception exception)
         /// <summary>
         /// Clears all the caches used during the build.
         /// </summary>
-        [SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods", MessageId = "System.GC.Collect", Justification = "Required because when calling this method, we want the memory back NOW.")]
         private void CleanupCaches()
         {
             if (_componentFactories.GetComponent(BuildComponentType.ConfigCache) is IConfigCache configCache)