[PM-30108] import discount from stripe (#6982)

* [PM-30108] import discount from stripe

* fix repo tests

* pr feedback

* wrap discounts in feature flag

* claude pr feedback

util/Migrator/DbScripts/2026-02-12_00_AddSubscriptionDiscountListSP.sql

@@ -0,0 +1,17 @@
+-- Add SubscriptionDiscount_List stored procedure for pagination
+CREATE OR ALTER PROCEDURE [dbo].[SubscriptionDiscount_List]
+    @Skip INT = 0,
+    @Take INT = 25
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        *
+    FROM
+        [dbo].[SubscriptionDiscountView]
+    ORDER BY [CreationDate] DESC
+    OFFSET @Skip ROWS
+    FETCH NEXT @Take ROWS ONLY
+END
+GO