Adjust the error to check for the ConstraintTemplate CRD missing

After updating to controller-runtime 0.15, it seems that a different
error is returned when a CRD is missing, so it caused an API server hit
every time the policy template sync controller reconciled. This uses the
new error.

Relates:
stolostron/backlog#27375

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

controllers/templatesync/template_sync.go

@@ -962,6 +962,7 @@ func (r *PolicyReconciler) cleanUpExcessTemplates(
 	}
 
 	tmplGVRs := []gvrScoped{}
+	var discoveryErr *discovery.ErrGroupDiscoveryFailed
 
 	// Query for Constraints if one was already synced successfully or the boolean is not yet set
 	if r.createdGkConstraint == nil || *r.createdGkConstraint {
@@ -995,7 +996,7 @@ func (r *PolicyReconciler) cleanUpExcessTemplates(
 					namespaced: false,
 				})
 			}
-		} else if meta.IsNoMatchError(err) {
+		} else if errors.As(err, &discoveryErr) {
 			// If there's no v1 ConstraintTemplate, try the v1beta1 version
 			gkConstraintTemplateListv1beta1 := gktemplatesv1beta1.ConstraintTemplateList{}
 			err := r.List(ctx, &gkConstraintTemplateListv1beta1, &client.ListOptions{})
@@ -1026,7 +1027,7 @@ func (r *PolicyReconciler) cleanUpExcessTemplates(
 					})
 				}
 				// Log and ignore other errors to allow cleanup to continue since Gatekeeper may not be installed
-			} else if meta.IsNoMatchError(err) {
+			} else if errors.As(err, &discoveryErr) {
 				reqLogger.Info("The ConstraintTemplate CRD is not installed")
 				r.setCreatedGkConstraint(false)
 			} else {
@@ -1059,7 +1060,7 @@ func (r *PolicyReconciler) cleanUpExcessTemplates(
 				})
 			}
 		}
-	} else if meta.IsNoMatchError(err) {
+	} else if errors.As(err, &discoveryErr) {
 		crdsv1beta1 := extensionsv1beta1.CustomResourceDefinitionList{}
 		err := r.List(ctx, &crdsv1beta1, &crdQuery)
 		if err != nil {