[PM-12601] Add discount to MSP during creation in Admin Portal (#5391)

* Add Provider DiscountId to database and Stripe customer

* Fix tests

* Add missing EF migrations

* Run dotnet format

src/Admin/AdminConsole/Models/CreateMspProviderModel.cs

@@ -10,6 +10,9 @@ public class CreateMspProviderModel : IValidatableObject
     [Display(Name = "Owner Email")]
     public string OwnerEmail { get; set; }
 
+    [Display(Name = "Subscription Discount")]
+    public string DiscountId { get; set; }
+
     [Display(Name = "Teams (Monthly) Seat Minimum")]
     public int TeamsMonthlySeatMinimum { get; set; }
 
@@ -20,7 +23,8 @@ public class CreateMspProviderModel : IValidatableObject
     {
         return new Provider
         {
-            Type = ProviderType.Msp
+            Type = ProviderType.Msp,
+            DiscountId = DiscountId
         };
     }
 

src/Admin/AdminConsole/Views/Providers/CreateMsp.cshtml

@@ -1,3 +1,4 @@
+@using Bit.Core.Billing.Constants
 @model CreateMspProviderModel
 
 @{
@@ -12,6 +13,19 @@
             <label asp-for="OwnerEmail" class="form-label"></label>
             <input type="text" class="form-control" asp-for="OwnerEmail">
         </div>
+        <div class="mb-3">
+            @{
+                var selectList = new List<SelectListItem>
+                {
+                    new ("No discount", string.Empty, true),
+                    new ("20% - Open", StripeConstants.CouponIDs.MSPDiscounts.Open),
+                    new ("35% - Silver", StripeConstants.CouponIDs.MSPDiscounts.Silver),
+                    new ("50% - Gold", StripeConstants.CouponIDs.MSPDiscounts.Gold)
+                };
+            }
+            <label asp-for="DiscountId" class="form-label"></label>
+            <select class="form-select" asp-for="DiscountId" asp-items="selectList"></select>
+        </div>
         <div class="row">
             <div class="col-sm">
                 <div class="mb-3">