Minor. This removes a few "testdata" dirs from .make/all_go_dirs.mk
-hack/make-rules/helpers/go2make/testdata/dir-with-gofiles
-test/conformance/testdata
-test/instrumentation/testdata/pkg/kubelet/metrics
-test/instrumentation/testdata/staging/src/k8s.io/metrics
-test/typecheck/testdata/bad
-test/typecheck/testdata/good
-test/typecheck/testdata/good/testdata
-vendor/k8s.io/kubectl/pkg/cmd/edit/testdata
This list of dirs is used to figure out which directories need codegen,
and none of these do.