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Enforce request index UID for staged sketch metadata

stage_sketch_splits deserializes and forwards splits_metadata_json without checking that each ParquetSplitMetadata.index_uid matches request.index_uid, so a caller can submit StageSketchSplitsRequest.index_uid = A while embedding metadata for B. In file-backed mode this stores rows under index A whose serialized metadata claims B, which breaks request-scoped invariants and can cause later list/publish responses to carry inconsistent index identities; this path should validate equality (or overwrite metadata index UID from the request) before staging.

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