Set content labels based on content type

Give control of the content labeling process for children to
the client. This allows the client to control the names
associated with the labels and filter out labels.

Signed-off-by: Derek McGowan <derek@mcg.dev>

client_test.go

@@ -229,6 +229,11 @@ func TestImagePullWithDiscardContent(t *testing.T) {
 	ctx, cancel := testContext(t)
 	defer cancel()
 
+	err = client.ImageService().Delete(ctx, testImage, images.SynchronousDelete())
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	ls := client.LeasesService()
 	l, err := ls.Create(ctx, leases.WithRandomID(), leases.WithExpiration(24*time.Hour))
 	if err != nil {
@@ -238,7 +243,7 @@ func TestImagePullWithDiscardContent(t *testing.T) {
 	img, err := client.Pull(ctx, testImage,
 		WithPlatformMatcher(platforms.Default()),
 		WithPullUnpack,
-		WithDiscardContent,
+		WithChildLabelMap(images.ChildGCLabelsFilterLayers),
 	)
 	// Synchronously garbage collect contents
 	if errL := ls.Delete(ctx, l, leases.SynchronousDelete); errL != nil {