fix: address multi-arch review feedback

Author: maxsxu

Makefile

@@ -204,7 +204,7 @@ rbac: manifests
 
 release: manifests kustomize crd rbac manager operator-docker-image helm-crds
 
-operator-docker-image: manager test
+operator-docker-image: test
 ifeq ($(MULTI_PLATFORM_BUILD),true)
 	docker buildx build --platform $(PLATFORMS) --push -f operator.Dockerfile -t $(OPERATOR_IMG) -t $(OPERATOR_IMG_LATEST) .
 else

images/pulsar-functions-python-runner/pulsarctl.Dockerfile

@@ -1,7 +1,6 @@
 ARG PULSAR_IMAGE
 ARG PULSAR_IMAGE_TAG
 ARG PYTHON_VERSION=3.12
-ARG TARGETARCH
 FROM ${PULSAR_IMAGE}:${PULSAR_IMAGE_TAG} as pulsar
 
 FROM python:${PYTHON_VERSION}-alpine