Skip nextafter test with IFRT for unsupported dtype. #17948
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Skip nextafter test with IFRT for unsupported dtype.
IFRT calls tf2xla's EncodePrimitiveTypeAsDataType function to get a TF dtype from an XLA dtype. But there is no TF dtype corresponding to XLA's F8E4M3B11FNUZ type.
Link to EncodePrimitiveTypeAsDataType: https://github.com/tensorflow/tensorflow/blob/ac3bde91780b649f6142a578f58f249314c3136d/tensorflow/compiler/tf2xla/type_util.cc#L98