feat(registry): add GPO override warning and WhatIf dry-run previews (#611)

Co-authored-by: Jeffrey <9938813+Raphire@users.noreply.github.com>

Scripts/Features/ImportRegistryFile.ps1

@@ -21,6 +21,12 @@ function ImportRegistryFile {
     $importScript = {
         param($targetRegFilePath, $hiveContext)
 
+        if ($script:Params.ContainsKey("WhatIf")) {
+            Invoke-RegistryOperationsFromRegFile -RegFilePath $targetRegFilePath
+            Write-Host ""
+            return
+        }
+
         # When the target user's hive is already loaded under their SID, the .reg file's
         # HKEY_USERS\Default paths won't match. Use the PowerShell registry writer instead,
         # which remaps Default → SID via Split-RegistryPath.