Refactor codegen to use kube_codegen.sh script

hack/boilerplate.go.txt

@@ -0,0 +1,15 @@
+/*
+Copyright 2024 The Knative Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/

hack/update-codegen.sh

@@ -25,9 +25,11 @@ echo "=== Update Codegen for $MODULE_NAME"
 
 group "Kubernetes Codegen"
 
-generate-groups "deepcopy" \
-  knative.dev/client/pkg/apis/client/v1alpha1/generated knative.dev/client/pkg/apis \
-  client:v1alpha1 "$@"
+source "${CODEGEN_PKG}/kube_codegen.sh"
+
+kube::codegen::gen_helpers \
+  --boilerplate "${REPO_ROOT_DIR}/hack/boilerplate.go.txt" \
+  "${REPO_ROOT_DIR}/pkg/apis"
 
 group "Update deps post-codegen"