Refactor Dell driver catalog download logic

Moves the logic for downloading and preparing the Dell driver catalog from the main build scripts directly into the specific Dell driver download task.

This change encapsulates all Dell-specific logic within the `Save-DellDriversTask` function, making it self-sufficient. Each parallel task now manages its own dependency on the catalog file, which simplifies the main script's responsibilities.

Also includes minor code style formatting.

FFUDevelopment/FFU.Common/FFU.Common.Parallel.psm1

@@ -173,12 +173,10 @@ function Invoke-ParallelProcessing {
                                     -CompressToWim $localJobArgs['CompressToWim']
                             }
                             'Dell' {
-                                # DellCatalogXmlPath might be null if catalog prep failed; Save-DellDriversTask should handle this.
                                 $taskResult = Save-DellDriversTask -DriverItemData $currentItem `
                                     -DriversFolder $localJobArgs['DriversFolder'] `
                                     -WindowsArch $localJobArgs['WindowsArch'] `
                                     -WindowsRelease $localJobArgs['WindowsRelease'] `
-                                    -DellCatalogXmlPath $localJobArgs['DellCatalogXmlPath'] `
                                     -ProgressQueue $localProgressQueue `
                                     -CompressToWim $localJobArgs['CompressToWim']
                             }