Add finishes in bulk instead of cloning one at a time

Create several finishes at once in a bulk operation rather than cloning and renaming each one.

1. Several finishes can be created together in one bulk operation.

2. Default (non-owned) catalogue SKUs can be selected in bulk across categories.

3. The Bulk Clone action clones them into the same group with an optional 'clone sales channels and prices' tick.

4. The clones become owned and editable.

5. When a laminate or shade is missing from the catalogue, finishes can also be added in bulk in one upload, each with its own image, instead of cloning and renaming one at a time.

6. Catalogue items can be cloned in bulk, not only one at a time, so several items close to existing ones can be duplicated and renamed together.