internal/pkg: collection helper-artifact

This was moved from internal/rosa because it is considered generally useful.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -527,7 +527,7 @@ func main() {
 					}
 					presets[i] = p
 				}
-				root := make(rosa.Collect, 0, 6+len(args))
+				root := make(pkg.Collect, 0, 6+len(args))
 				root = rosa.Std.AppendPresets(root, presets...)
 
 				if flagWithToolchain {
@@ -543,7 +543,7 @@ func main() {
 
 				if _, _, err := cache.Cure(&root); err == nil {
 					return errors.New("unreachable")
-				} else if !errors.Is(err, rosa.Collected{}) {
+				} else if !pkg.IsCollected(err) {
 					return err
 				}