Revert "[tsgen] Handle different get/set types for value_objects too." #22569
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Reverts #22439
This was working okay for when the user gets a value_object in TS, but when setting a value_object with an object literal this code does not type check correctly. There's an upstream issues about this. I think instead of generating getter/setters we can instead have two type definitions for each value_object. One for reading from TS and one for write from TS. Until I get around to trying that I think we can revert this in the meantime.