Fix last run-in-gopath user: typecheck

This now works across modules

Verified by introducing errors in 2 different modules and running.

hack/verify-typecheck.sh

@@ -23,18 +23,15 @@ set -o pipefail
 
 KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 source "${KUBE_ROOT}/hack/lib/init.sh"
-
-kube::golang::verify_go_version
-
 cd "${KUBE_ROOT}"
 
-# As of June, 2020 the typecheck tool is written in terms of go/packages, but
-# that library doesn't work well with multiple modules.  Until that is done,
-# force this tooling to run in a fake GOPATH.
+kube::golang::new::setup_env
+kube::golang::verify_go_version
+
 ret=0
 TYPECHECK_SERIAL="${TYPECHECK_SERIAL:-false}"
-hack/run-in-gopath.sh \
-    go run test/typecheck/main.go "$@" "--serial=$TYPECHECK_SERIAL" || ret=$?
+go run ./test/typecheck "$@" "--serial=$TYPECHECK_SERIAL" || ret=$?
+
 if [[ $ret -ne 0 ]]; then
   echo "!!! Type Check has failed. This may cause cross platform build failures." >&2
   echo "!!! Please see https://git.k8s.io/kubernetes/test/typecheck for more information." >&2