K8s: use +enum tag in playlist and unstructured dummy (#82022)

pkg/apis/datasource/v0alpha1/types.go

@@ -21,7 +21,6 @@ type DataSourceConnection struct {
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 type DataSourceConnectionList struct {
 	metav1.TypeMeta `json:",inline"`
-	// +optional
 	metav1.ListMeta `json:"metadata,omitempty"`
 
 	Items []DataSourceConnection `json:"items,omitempty"`