Rename KUBE_OUTPUT_BINPATH -> KUBE_OUTPUT_BIN

"...PATH" doesn't add anything and confuses it with KUBE_OUTPUT_SUBPATH.

hack/verify-golangci-lint.sh

@@ -45,7 +45,7 @@ source "${KUBE_ROOT}/hack/lib/init.sh"
 source "${KUBE_ROOT}/hack/lib/util.sh"
 
 # Ensure that we find the binaries we build before anything else.
-export GOBIN="${KUBE_OUTPUT_BINPATH}"
+export GOBIN="${KUBE_OUTPUT_BIN}"
 PATH="${GOBIN}:${PATH}"
 
 invocation=(./hack/verify-golangci-lint.sh "$@")