Adjust key computation for TF functions to use determinstic proto serialization.

Also serializes TFF types and uses the same path, since TFF TensorType strings dont currently differentiate between TensorShape(None) and scalar tensors.

PiperOrigin-RevId: 346613971

tensorflow_federated/python/core/impl/executors/eager_tf_executor.py

@@ -294,8 +294,9 @@ def _to_computation_internal_rep(*, value: pb.Computation,
                                  type_spec: computation_types.StructType,
                                  device: tf.config.LogicalDevice):
   """Converts a `pb.Computation` to a `tf.function`."""
-  key = (value.SerializeToString(), str(type_spec),
-         device.name if device else None)
+  key = (value.SerializeToString(deterministic=True),
+         type_serialization.serialize_type(type_spec).SerializeToString(
+             deterministic=True), device.name if device else None)
   cached_fn = tf_function_cache.get(key)
   if cached_fn is not None:
     return cached_fn