[FW][FIX] sale_loyalty: prevent coupon removal on double apply #159861
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Addresses the issue where reapplying an already applied coupon
in the website shop led to the disappearance of the discount.
With this fix, the discount remains applied, and the system
continues to inform the user that the coupon has already been
used, preventing confusion and maintaining consistency in the
discount application process.
task-3621246
Forward-Port-Of: #153485