Update tests; run fuzzing (#294)

Run fuzzing tests in CI.

Use race detector when running tests.

Add missing `t.Helper()` calls.

Update test helpers in `pkg/bindfilter` to use `RtlGetNtVersionNumbers`
instead of reading registry, and skip tests if not running as admin.

Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>

pipe_test.go

@@ -223,6 +223,8 @@ func TestCloseAbortsListen(t *testing.T) {
 }
 
 func ensureEOFOnClose(t *testing.T, r io.Reader, w io.Closer) {
+	t.Helper()
+
 	b := make([]byte, 10)
 	w.Close()
 	n, err := r.Read(b)