[XLA:Python] Default to passing no parameter replication metadata.
[XLA:Python] Default to passing no parameter replication metadata.

XLA only wants this metadata on the root computation, so it may not be preserved correctly under optimizations when added to non-root computations.

PiperOrigin-RevId: 303642053
Change-Id: Ia5fc4f2a7480ec8650878a3fb4abd6cd515dd42f

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