fix: populate participating_peers to enable correct peer penalization #8526
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Backfill intended to penalize only peers that actually participated in serving batches, but
participating_peerswas never populated. This meant no peers were penalized on terminal faulty failure. This change records the block peer on successful batch downloads in on_block_response() and records the peer on error in inject_error() after registering a failed download. This restores the intended behavior without altering APIs or broader flow.