Chia-Network / chia-blockchain / 27618964646

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Skip DataLayer upload/cleanup for stores with no committed data (#20992)

* Skip DataLayer upload/cleanup for stores with no committed data

For a store whose on-chain singleton is still at generation 0 (created but
no data committed yet) there is no local tree, so get_tree_root raised
"No generations found". upload_files and clean_old_full_tree_files both hit
this, and update_subscription caught it and logged an ERROR with a full
traceback every management cycle for every such store.

Add the same generation-0 early return that fetch_and_validate already uses
to both upload_files and clean_old_full_tree_files, so an empty store is a
quiet no-op instead of recurring error spam.

* Clarify DataLayer empty-store log message

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