Don't construct Pelican URLs for stashcp copies

Stashcp needs to determine the copy direction dynamically, so we can't treat
the source as a defacto Pelican URL. This change lets DoCopy determine the
direction.

cmd/object_copy.go

@@ -167,11 +167,6 @@ func copyMain(cmd *cobra.Command, args []string) {
 	lastSrc := ""
 
 	for _, src := range source {
-		src, result = utils.UrlWithFederation(src)
-		if result != nil {
-			lastSrc = src
-			break
-		}
 		isRecursive, _ := cmd.Flags().GetBool("recursive")
 		_, result = client.DoCopy(ctx, src, dest, isRecursive, client.WithCallback(pb.callback), client.WithTokenLocation(tokenLocation), client.WithCaches(caches...))
 		if result != nil {