fix: maintain existing discounts in get_pricing_rule_for_item #45345
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closes : Support Ticket - 29277
Related PR: #44708
Issue:
Previously, when the get_pricing_rule_for_item method was triggered due to a change in quantity, it reset both discount_amount and discount_percentage to 0, regardless of existing values.
Fix:
The method now checks if the first argument contains discount_amount and discount_percentage. If available, it uses those values; otherwise, it defaults to 0.