…tafusion-ballista PRs #42 + #43) (spiceai#10919)

Bumps ballista-core / ballista-executor / ballista-scheduler to spiceai-52.5
tip (07be66a8), which carries:

  1. (#42) Wrap ObjectStoreShuffleStorage in object_store::prefix::PrefixStore
     so the URL path is reattached to every key — without this, writers
     uploaded to s3://bucket/<job>/... while readers looked under
     s3://bucket/<prefix>/<job>/... and got NotFound on every reduce stage.

  2. (#43) Dispatch s3:// partition paths inside BallistaClient::fetch_partition
     to the existing object-store reader. Before this the gRPC FetchPartition
     handler called tokio::fs::File::open("s3://...") and failed every
     single-batch query (q1) and reduce-stage fetch (q2+).

  3. (#43) Replace per-batch serialize_batch_to_ipc_bytes with a long-lived
     StreamingMultipartIpcUploader: one StreamWriter per output partition
     means the IPC stream has one header and one EOS marker instead of one
     stream per batch concatenated together. Fixes the
     ArrowError(IpcError("Unexpected EOS")) we saw on multi-batch hash-
     repartition queries.