[FIX] pos_loyalty: fix runbot error

Use of `addOrderline` presses the numpad, after clicking the product,
even if the quantity of the product being added is only 1. Because of
this, there might be a rogue press which calls `_updateSelectedOrderline`
at the wrong timing. This can be proven by looking at the screenshot where
the quantity of `Small Shelf` is 11, not 1. In this particular failing tour,
the sequence of steps properly aligned resulting to this runbot issue. To
make sure runbot isn't failing randomly, we replace `addOrderline` with
manual `click product` and `orderline check`.

Runbot: 3883, 3884, 3886
X-original-commit: 40aef1c4161f21801c1bbae823d9b5c46a035478
Part-of: odoo/odoo#93124

addons/pos_loyalty/static/src/js/tours/PosLoyaltyRewardButtonTour.js

@@ -98,9 +98,11 @@ PosLoyalty.exec.finalizeOrder('Cash', '10');
 
 // Promotion: 2 items of shelves, get desk_pad/monitor_stand free
 // This is the 5th order.
-ProductScreen.exec.addOrderline('Wall Shelf Unit', '1');
+ProductScreen.do.clickDisplayedProduct('Wall Shelf Unit');
+ProductScreen.check.selectedOrderlineHas('Wall Shelf Unit', '1.00');
 PosLoyalty.check.isRewardButtonHighlighted(false);
-ProductScreen.exec.addOrderline('Small Shelf', '1');
+ProductScreen.do.clickDisplayedProduct('Small Shelf');
+ProductScreen.check.selectedOrderlineHas('Small Shelf', '1.00');
 PosLoyalty.check.isRewardButtonHighlighted(true);
 // Click reward product. Should be automatically added as reward.
 ProductScreen.do.clickDisplayedProduct('Desk Pad');