Fix sync.WaitGroup usage in concurrent RemoveImage test

The test was incorrectly calling wg.Go() which doesn't exist on
sync.WaitGroup. Fixed to use the proper pattern: wg.Add(1), go func(),
and defer wg.Done().

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

Author: saschagrunert

pkg/validate/image_consistency.go

@@ -133,7 +133,9 @@ var _ = framework.KubeDescribe("Image Consistency", func() {
 		results := make(chan removeResult, 5)
 
 		for range 5 {
-			wg.Go(func() {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
 				// Use the specific image ID for removal to avoid ambiguity
 				remErr := c.RemoveImage(context.Background(), &runtimeapi.ImageSpec{Image: imageID})
 
@@ -142,7 +144,7 @@ var _ = framework.KubeDescribe("Image Consistency", func() {
 				imageFound := (status != nil)
 
 				results <- removeResult{err: remErr, imageFound: imageFound}
-			})
+			}()
 		}
 		wg.Wait()
 		close(results)