Merge forwardport of #11710 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/11710.patch (created by @gabrielqs-redstage) based on commit(s):
  1. fb84267

Fixed GitHub Issues in 2.3-develop branch:
  - #9763: When go checkout,Cart Price Rules 25%test coupon code can go wrong (reported by @michaeldyl520)

app/code/Magento/Checkout/view/frontend/web/js/model/resource-url-manager.js

@@ -75,8 +75,8 @@ define([
                             quoteId: quoteId
                         } : {},
                     urls = {
-                        'guest': '/guest-carts/' + quoteId + '/coupons/' + couponCode,
-                        'customer': '/carts/mine/coupons/' + couponCode
+                        'guest': '/guest-carts/' + quoteId + '/coupons/' + encodeURIComponent(couponCode),
+                        'customer': '/carts/mine/coupons/' + encodeURIComponent(couponCode)
                     };
 
                 return this.getUrl(urls, params);