(chocolateyGH-1866) Restrict pending package removal to top level

Previously, chocolatey would search all sub directories when trying to
remove pending packages as part of other commands. This was causing
several second execution times when sub directories were large and/or
symlinked on a network drive.

By restricting the cleanup to the top directory only, the command
execution times will be much more consistent.

src/chocolatey/infrastructure.app/tasks/RemovePendingPackagesTask.cs

@@ -60,13 +60,13 @@ private void handle_message(PreRunMessage message)
         {
             this.Log().Debug(ChocolateyLoggers.Verbose, "[Pending] Removing all pending packages that should not be considered installed...");
 
-            var pendingFiles = _fileSystem.get_files(ApplicationParameters.PackagesLocation, ApplicationParameters.PackagePendingFileName, SearchOption.AllDirectories).ToList();
+            var pendingFiles = _fileSystem.get_files(ApplicationParameters.PackagesLocation, ApplicationParameters.PackagePendingFileName).ToList();
             foreach (var pendingFile in pendingFiles.or_empty_list_if_null())
             {
                 var packageFolder = _fileSystem.get_directory_name(pendingFile);
                 string packageFolderName = _fileSystem.get_directory_info_for(packageFolder).Name;
 
-                var pendingSkipFiles = _fileSystem.get_files(packageFolder, PENDING_SKIP_FILE, SearchOption.AllDirectories).ToList();
+                var pendingSkipFiles = _fileSystem.get_files(packageFolder, PENDING_SKIP_FILE).ToList();
                 if (pendingSkipFiles.Count != 0)
                 {
                     this.Log().Warn("Pending file found for {0}, but a {1} file was also found. Skipping removal".format_with(packageFolderName, PENDING_SKIP_FILE));