lib/resourcebuilder/apiext: Error on unrecognized CRD version

Error for unrecognized CRD version, because that will be easier to
debug than trying to figure out why a CRD manifest is being silently
ignored by the CVO (which is what we've done since the version switch
landed in 4ee7b07, Add apiextensions.k8s.io/v1 support for CRDs,
2019-10-22, #259).

lib/resourcebuilder/apiext.go

@@ -2,6 +2,7 @@ package resourcebuilder
 
 import (
 	"context"
+	"fmt"
 
 	"k8s.io/klog"
 
@@ -68,6 +69,8 @@ func (b *crdBuilder) Do(ctx context.Context) error {
 			return err
 		}
 		name = crd.Name
+	default:
+		return fmt.Error("unrecognized CustomResourceDefinition version: %v", crd.(type))
 	}
 
 	if updated {