Billing - Fix credit upgrade invoice error (#21097)

In createImmediateUpgradeInvoice, the invoice is finalized with
auto_advance: true, which causes Stripe to automatically attempt payment
asynchronously. Then the explicit stripe.invoices.pay(invoice.id) call
races against that auto-payment — if Stripe already paid it, this throws
"Invoice is already paid".

The fix is to finalize with auto_advance: false and keep the explicit
pay call

packages/twenty-server/src/engine/core-modules/billing/stripe/services/stripe-invoice.service.ts

@@ -68,7 +68,7 @@ export class StripeInvoiceService {
     });
 
     await this.stripe.invoices.finalizeInvoice(invoice.id, {
-      auto_advance: true,
+      auto_advance: false,
     });
 
     await this.stripe.invoices.pay(invoice.id);