update to use controller-gen v0.19.0

Author: shuqz

Makefile

@@ -132,7 +132,6 @@ docker-push-w-buildx:
 # find or download controller-gen
 # download controller-gen if necessary
 controller-gen:
-ifeq (, $(shell which controller-gen))
 	@{ \
 	set -e ;\
 	CONTROLLER_GEN_TMP_DIR=$$(mktemp -d) ;\
@@ -142,9 +141,6 @@ ifeq (, $(shell which controller-gen))
 	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
 	}
 CONTROLLER_GEN=$(GOBIN)/controller-gen
-else
-CONTROLLER_GEN=$(shell which controller-gen)
-endif
 
 # find or download mockgen
 # download mockgen if necessary