Use a batch action instead of a queue to set/update order items SKU on purchased entity update/deletion via its form

We need to consider if the queue worker should be kept after the batch operation introduction.
We also need tests for this feature.

I guess we can remove the queue worker. If a purchasable entity is updated programmatically, related order items can be too.

Batch op still needs to be implemented for purchasable entity deletion.

The MR should be ready ; it replaces queue workers with batch op to set/update order items SKU on purcahasable entity update/deletion through the UI.