[PM-21638] Stripe .NET v48 (#6202)

* Upgrade Stripe.net to v48.4.0

* Update PreviewTaxAmountCommand

* Remove unused UpcomingInvoiceOptionExtensions

* Added SubscriptionExtensions with GetCurrentPeriodEnd

* Update PremiumUserBillingService

* Update OrganizationBillingService

* Update GetOrganizationWarningsQuery

* Update BillingHistoryInfo

* Update SubscriptionInfo

* Remove unused Sql Billing folder

* Update StripeAdapter

* Update StripePaymentService

* Update InvoiceCreatedHandler

* Update PaymentFailedHandler

* Update PaymentSucceededHandler

* Update ProviderEventService

* Update StripeEventUtilityService

* Update SubscriptionDeletedHandler

* Update SubscriptionUpdatedHandler

* Update UpcomingInvoiceHandler

* Update ProviderSubscriptionResponse

* Remove unused Stripe Subscriptions Admin Tool

* Update RemoveOrganizationFromProviderCommand

* Update ProviderBillingService

* Update RemoveOrganizatinoFromProviderCommandTests

* Update PreviewTaxAmountCommandTests

* Update GetCloudOrganizationLicenseQueryTests

* Update GetOrganizationWarningsQueryTests

* Update StripePaymentServiceTests

* Update ProviderBillingControllerTests

* Update ProviderEventServiceTests

* Update SubscriptionDeletedHandlerTests

* Update SubscriptionUpdatedHandlerTests

* Resolve Billing test failures

I completely removed tests for the StripeEventService as they were using a system I setup a while back that read JSON files of the Stripe event structure. I did not anticipate how frequently these structures would change with each API version and the cost of trying to update these specific JSON files to test a very static data retrieval service far outweigh the benefit.

* Resolve Core test failures

* Run dotnet format

* Remove unused provider migration

* Fixed failing tests

* Run dotnet format

* Replace the old webhook secret key with new one (#6223)

* Fix compilation failures in additions

* Run dotnet format

* Bump Stripe API version

* Fix recent addition: CreatePremiumCloudHostedSubscriptionCommand

* Fix new code in main according to Stripe update

* Fix InvoiceExtensions

* Bump SDK version to match API Version

* Fix provider invoice generation validation

* More QA fixes

* Fix tests

* QA defect resolutions

* QA defect resolutions

* Run dotnet format

* Fix tests

---------

Co-authored-by: cyprain-okeke <108260115+cyprain-okeke@users.noreply.github.com>

src/Admin/Models/StripeSubscriptionsModel.cs

@@ -1,45 +0,0 @@
-// FIXME: Update this file to be null safe and then delete the line below
-#nullable disable
-
-using System.ComponentModel.DataAnnotations;
-using Bit.Core.Models.BitStripe;
-
-namespace Bit.Admin.Models;
-
-public class StripeSubscriptionRowModel
-{
-    public Stripe.Subscription Subscription { get; set; }
-    public bool Selected { get; set; }
-
-    public StripeSubscriptionRowModel() { }
-    public StripeSubscriptionRowModel(Stripe.Subscription subscription)
-    {
-        Subscription = subscription;
-    }
-}
-
-public enum StripeSubscriptionsAction
-{
-    Search,
-    PreviousPage,
-    NextPage,
-    Export,
-    BulkCancel
-}
-
-public class StripeSubscriptionsModel : IValidatableObject
-{
-    public List<StripeSubscriptionRowModel> Items { get; set; }
-    public StripeSubscriptionsAction Action { get; set; } = StripeSubscriptionsAction.Search;
-    public string Message { get; set; }
-    public List<Stripe.Price> Prices { get; set; }
-    public List<Stripe.TestHelpers.TestClock> TestClocks { get; set; }
-    public StripeSubscriptionListOptions Filter { get; set; } = new StripeSubscriptionListOptions();
-    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
-    {
-        if (Action == StripeSubscriptionsAction.BulkCancel && Filter.Status != "unpaid")
-        {
-            yield return new ValidationResult("Bulk cancel is currently only supported for unpaid subscriptions");
-        }
-    }
-}