Adds ineffassign to GO linter script.

Changes:
 - Enables ineffassign check in the verify scripts.
 - Fixes lint errs.

pkg/apis/autoscaling/v1/conversion.go

@@ -362,6 +362,7 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler(i
 		}
 		// copy before mutating
 		if !copiedAnnotations {
+			//nolint:ineffassign
 			copiedAnnotations = true
 			out.Annotations = autoscaling.DeepCopyStringMap(out.Annotations)
 		}

pkg/apis/autoscaling/v2beta1/conversion.go

@@ -299,6 +299,7 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v2beta1_HorizontalPodAutosca
 		}
 		// copy before mutating
 		if !copiedAnnotations {
+			//nolint:ineffassign
 			copiedAnnotations = true
 			out.Annotations = autoscaling.DeepCopyStringMap(out.Annotations)
 		}