[Admin][UI][Bulk actions] Require confirmation before completing bulk deletes

[forkata]

Currently, bulk deleting resources such as products happens without confirmation. This is not ideal, so we want to introduce a manual confirmation step.

There's no specific design for this, but we can reference what we have for deleting a product with a different copy such as

Remove 3 products?
This can't be undone.

[forkata]

The first part of this is done, which is adding the ability to confirm a batch action. I think we may want this to be the default behaviour for all batch actions?

The second part is implementing the modal instead of the default browser confirm dialog.

[forkata]

First part of this change was merged here #5702