graph/db+sqldb: validate prune log migration using batching

As was done in the previous commits for nodes & channels, we update the
migratePruneLog function here so that it validates migrated entries in
batches rather than one-by-one.

sqldb/sqlc/querier.go

@@ -71,6 +71,7 @@ type Querier interface {
 	GetNodeIDByPubKey(ctx context.Context, arg GetNodeIDByPubKeyParams) (int64, error)
 	GetNodesByIDs(ctx context.Context, ids []int64) ([]GraphNode, error)
 	GetNodesByLastUpdateRange(ctx context.Context, arg GetNodesByLastUpdateRangeParams) ([]GraphNode, error)
+	GetPruneEntriesForHeights(ctx context.Context, heights []int64) ([]GraphPruneLog, error)
 	GetPruneHashByHeight(ctx context.Context, blockHeight int64) ([]byte, error)
 	GetPruneTip(ctx context.Context) (GraphPruneLog, error)
 	GetPublicV1ChannelsBySCID(ctx context.Context, arg GetPublicV1ChannelsBySCIDParams) ([]GraphChannel, error)