Fall back to the DNS handler chain for route query types a peer cannot resolve

client/internal/routemanager/dnsinterceptor/handler_windows_test.go

@@ -0,0 +1,7 @@
+//go:build windows
+
+package dnsinterceptor
+
+// GetInterfaceGUIDString completes iface.WGIface on Windows, which requires the
+// interface GUID for DNS registration.
+func (fakeWGIface) GetInterfaceGUIDString() (string, error) { return "", nil }