Milestone 2b Update (#6515)

* feat(billing): add feature flag

* feat(billing): implement feature flag

* fix(billing): update logic

* fix(billing): revert spacing

Author: sbrown-livefront

src/Core/Billing/Pricing/PricingClient.cs

@@ -123,7 +123,9 @@ public async Task<List<PremiumPlan>> ListPremiumPlans()
             return [CurrentPremiumPlan];
         }
 
-        var response = await httpClient.GetAsync("plans/premium");
+        var milestone2Feature = featureService.IsEnabled(FeatureFlagKeys.PM23341_Milestone_2);
+
+        var response = await httpClient.GetAsync($"plans/premium?milestone2={milestone2Feature}");
 
         if (response.IsSuccessStatusCode)
         {

src/Core/Constants.cs

@@ -187,6 +187,7 @@ public static class FeatureFlagKeys
     public const string PM23713_PremiumBadgeOpensNewPremiumUpgradeDialog = "pm-23713-premium-badge-opens-new-premium-upgrade-dialog";
     public const string PremiumUpgradeNewDesign = "pm-24033-updat-premium-subscription-page";
     public const string PM26793_FetchPremiumPriceFromPricingService = "pm-26793-fetch-premium-price-from-pricing-service";
+    public const string PM23341_Milestone_2 = "pm-23341-milestone-2";
 
     /* Key Management Team */
     public const string ReturnErrorOnExistingKeypair = "return-error-on-existing-keypair";