Bug Fix: Ensure Limited Usage Coupon is Applied Only Once

[Safemood]

This PR addresses the issue of Limited Usage Coupons being mistakenly applied multiple times. The fix involves removing the coupon from the list when it reaches its usage limit, preventing further unintended applications.

Additionally, test cases have been added to validate this behavior. These tests confirm that when a Limited Usage Coupon reaches its usage limit, it is properly removed from the list, ensuring reliable prevention of the bug's recurrence.

it('applies limited usage coupon only once', function () {


    Coupon::add([
        'code' => 'LIMITED50',
        'discount' => 50,
        'usageLimit' => 1, // Limited to 1 uses
        'startDate' => now(),
        'endDate' => now()->addWeek(),
    ]);

 
    $items = [
        [
            "id" => 1,
            "product_id" => 1,
            "product_name" => "Product 1",
            "quantity" => 5,
            "price" => 10
        ],
        [
            "id" => 2,
            "product_id" => 2,
            "product_name" => "Product 2",
            "quantity" => 2,
            "price" => 25
        ]
    ];

    $discountedTotal1 = DiscountifyFacade::setItems($items)
        ->applyCoupon('LIMITED50')
        ->total();

    $appleied1 =  DiscountifyFacade::coupons()->appliedCoupons();


    $discountedTotal2 = DiscountifyFacade::setItems($items)
        ->applyCoupon('LIMITED50')
        ->total();

    $appleied2 =  DiscountifyFacade::coupons()->appliedCoupons();


    expect($discountedTotal1)->toBe(floatval(50));
    expect($appleied1)->not->toBeEmpty();
    expect($appleied1[0]['code'])->toEqual('LIMITED50');

    expect($discountedTotal2)->toBe(floatval(100)); // without the discount
    expect($appleied2)->toBeEmpty();

});