Saleor syncToECI product sync creating high DB load

[JannikZed]

This run creates somehow high load on the DB because of unknown reason. We need to improve the logic here and make sure, that we don't update products too often - the updateAt timestamp does still not reflect the reality, which makes us update a lot in Saleor and makes us pull product changes back.. we need to improve here
Furthermore, we need to find out, why this run is creating such high DB load- somehow it is related to large update call (OrderLineItems) - we don't know, what prisma is doing here. No other sync job is taking that high load.