Change the directResponse.body.bytes format to byte

According to our documentation, base64-encoded values should be used in
this field, in which case `byte` is the correct format rather than
`binary`.

Author: dgn

kubernetes/customresourcedefinitions.gen.yaml

@@ -1195,6 +1195,7 @@ message HTTPBody {
     string string = 1;
 
     // response body as base64 encoded bytes.
+    // +kubebuilder:validation:Format=byte
     bytes bytes = 2;
   }
 }