[Woo POS] Coupons: Adds enableCouponsInPointOfSale feature flag (#15349)

Author: iamgabrielma

Experiments/Experiments/DefaultFeatureFlagService.swift

@@ -71,6 +71,8 @@ public struct DefaultFeatureFlagService: FeatureFlagService {
             return false
         case .pointOfSale:
             return buildConfig == .localDeveloper || buildConfig == .alpha
+        case .enableCouponsInPointOfSale:
+            return buildConfig == .localDeveloper || buildConfig == .alpha
         case .googleAdsCampaignCreationOnWebView:
             return true
         case .backgroundTasks:

Experiments/Experiments/FeatureFlag.swift

@@ -157,6 +157,10 @@ public enum FeatureFlag: Int {
     ///
     case pointOfSale
 
+    /// Enables coupons in Point of Sale
+    ///
+    case enableCouponsInPointOfSale
+
     /// Enables Google ads campaign creation on web view
     ///
     case googleAdsCampaignCreationOnWebView