Add linked products promo experiment

Author: rachelmcr

Experiments/Experiments/ABTest.swift

@@ -16,6 +16,10 @@ public enum ABTest: String, CaseIterable {
     /// Experiment ref: pbxNRc-1S0-p2
     case aaTestLoggedOut202208 = "woocommerceios_explat_aa_test_logged_out_202208"
 
+    /// A/B test for promoting linked products in Product Details.
+    /// Experiment ref: pbxNRc-1Pp-p2
+    case linkedProductsPromo = "woocommerceios_product_details_linked_products_banner"
+
     /// Returns a variation for the given experiment
     public var variation: Variation {
         ExPlat.shared?.experiment(rawValue) ?? .control

WooCommerce/Classes/ViewRelated/Products/Edit Product/ProductFormActionsFactory.swift

@@ -1,4 +1,5 @@
 import Yosemite
+import Experiments
 
 /// Edit actions in the product form. Each action allows the user to edit a subset of product properties.
 enum ProductFormEditAction: Equatable {
@@ -77,6 +78,7 @@ struct ProductFormActionsFactory: ProductFormActionsFactoryProtocol {
 
         let newLinkedProductsPromoViewModel = linkedProductsPromoViewModel
         let shouldShowLinkedProductsPromo = ServiceLocator.featureFlagService.isFeatureFlagEnabled(.linkedProductsPromo)
+        && ABTest.linkedProductsPromo.variation == .treatment(nil)
         && isLinkedProductsPromoEnabled
         && newLinkedProductsPromoViewModel.shouldBeVisible
         && product.upsellIDs.isEmpty