k3s/cmd/libs/go2idl/client-gen/test_apis

This dir can not be named "testdata" because of the way ugorji gnerates code.
Specifically, it emits a .go file and then calls `go run` on it.  Because
"testdata" is a special name to Go, it decides NOT to find the vendor dir, and
therefore fails to compile.  Just name it something else.