separate generate plugins and check diff step

Makefile

@@ -110,6 +110,7 @@ prow-presubmit-check: \
 	install-tools \
 	workspace-sync \
 	generate-kustomize-builtin-plugins \
+	builtin-plugins-diff \
 	test-unit-kustomize-plugins \
 	test-go-mod \
 	build-non-plugin-all \
@@ -185,7 +186,7 @@ test-examples-kustomize-against-latest-release: $(MYGOBIN)/mdrip
 
 # Pushes dependencies in the go.work file back to go.mod files of each workspace module.
 .PHONY: workspace-sync
-workspace sync:
+workspace-sync:
 	go work sync
 	./hack/doGoMod.sh tidy
 

Makefile-plugins.mk

@@ -97,13 +97,12 @@ generate-kustomize-builtin-plugins: $(builtplugins)
 		set -e; \
 		cd $${plugin}; \
 		go generate pluginator .; \
-	done; \
-	cd ../../../; \
-	make no-diff \
+	done
 
-# Check for diff, if diff is found, throw error code 1
-.PHONY: no-diff
-no-diff: $(builtplugins)
+# Check for diff by comparing current revision of generated plugins on HEAD and newly generated plugins on local branch, 
+# If diff is found, throw error code 1
+.PHONY: builtin-plugins-diff
+builtin-plugins-diff: $(builtplugins)
 	for file in $(abspath $(builtinplugins)); do \
 		echo "Checking for diff... $${file}" ; \
 		set -e ; \

plugin/builtin/patchtransformer/go.mod

@@ -3,6 +3,7 @@ module sigs.k8s.io/kustomize/plugin/builtin/patchtransformer
 go 1.20
 
 require (
+	github.com/stretchr/testify v1.8.1
 	gopkg.in/evanphx/json-patch.v5 v5.6.0
 	sigs.k8s.io/kustomize/api v0.14.0
 	sigs.k8s.io/kustomize/kyaml v0.14.3
@@ -26,7 +27,6 @@ require (
 	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.8.1 // indirect
 	github.com/xlab/treeprint v1.2.0 // indirect
 	go.starlark.net v0.0.0-20200306205701-8dd3e2ee1dd5 // indirect
 	golang.org/x/sys v0.8.0 // indirect