[FIX] loyalty,sale: fix combo item deletion and disallow combos as free products #180695
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Combo items were sometimes erroneously deleted. This was because we compared "real" records (saved in DB) with "virtual" records (not saved in DB). In some situations, the "virtual" records were simply wrappers around the "real" record, in which case they should be considered equal, but they weren't.
Combos need to be configured, so we can't allow them to be awarded as free products.