File based sink doesn't respect temp_location pipeline option

Unlike FileIO module, the FileBasedSink module doesn't respect the temp_location pipeline option. This isn't expected and documented properly in the respective module's documentation.

I do understand that the temp_location is technically a pipeline option that's only required by the DataflowRunner but I think it might be worth it to pluck it out of the DataflowRunner and make it be a global pipeline option.

In addition, I couldn't info on what is the difference between WriteToFiles and WriteToText transforms. It seems that the former uses the FileBasedSink and thus correctly writes temporary files to the temp_location when specified but the latter doesn't do that.