fix: turn GOPROXY=off for e2e tests

Author: faiq

make/go.mk

@@ -91,6 +91,7 @@ endif
 	env E2E_IMAGE_TAG="$$(gojq --raw-output '.version' $(REPO_ROOT)/dist/metadata.json)" \
 	  envsubst -no-unset -no-empty -i '$(E2E_CONF_FILE)' -o '$(E2E_CONF_FILE_ENVSUBST)'
 	env AWS_B64ENCODED_CREDENTIALS="$$(clusterawsadm bootstrap credentials encode-as-profile 2>/dev/null)" \
+	env GOPROXY=off \
 	  ginkgo run \
 	    --r \
 	    --show-node-events \