Backport promotion code batch fix from Solidus #57
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Backport Solidus PR 5383 with PR description:
When a new promotion with 2.5m new promo codes has created, it just generated about 250k promo codes and then stopped.
The PromotionBatch screen this error: Errored: #<ActiveRecord::RecordInvalid: Validation failed: Value has already been taken>
This PR rescues the exception raised by the Spree::PromotionCode creation and jumps to the next code to save, avoiding stopping the process completely. The PR also adds the ability to restart the PromotionCodeBatch from the latest PromotionCodes created.
Cf solidusio/solidus#5383